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Penn effect

January 21, 2023

The Penn effect is the economic finding that real income ratios between high and low income countries are systematically exaggerated by gross domestic product (GDP) conversion at market exchange rates. It is associated with what became the Penn World Table, and it has been a consistent econometric result since at least the 1950s.

The "Balassa–Samuelson effect" is a model cited as the principal cause of the Penn effect by neo-classical economics, as well as being a synonym of "Penn effect".

History

Classical economics made simple predictions about exchange rates; it was said that a basket of goods would cost roughly the same amount everywhere in the world, when paid for in some common currency (like gold)1. This is called the purchasing power parity (PPP) hypothesis, also expressed as saying that the real exchange rate (RER) between goods in various countries should be close to one. Fluctuations over time were expected by this theory but were predicted to be small and non-systematic.

Pre-1940, the PPP hypothesis found econometric support, but some time after the Second World War, a series of studies by a University of Pennsylvania team documented a modern relationship: countries with higher incomes consistently had higher prices of domestically produced goods (as measured by comparable price indices), when compared at market exchange rates.

In 1964 the modern theoretical interpretation was set down as the Balassa–Samuelson effect, with studies since then consistently confirming the original Penn effect. However, subsequent analysis has provided many other mechanisms through which the Penn effect can arise, and historical cases where it is expected, but not found. Up until 1994 the PPP-deviation tended to be known as the "Balassa-Samuelson effect", but in his review of progress "Facets of Balassa-Samuelson Thirty Years Later" Paul Samuelson acknowledged the debt that his theory owed to the data-gatherers, by coining the term "Penn effect" to describe the "basic fact" they uncovered, when he wrote:

"The Penn effect is an important phenomenon of actual history, but not an inevitable fact of life."

Understanding the Penn effect

Further information: Big Mac Index

Most things are cheaper in poor (low income) countries than in rich ones. Someone from a "first world" country on vacation in a "third world" country will usually find their money going a lot further abroad than at home. For instance, a Big Mac cost $7.84 in Norway and $2.39 in Egypt in January 2013, at the prevailing USD exchange rate for those two local currencies, despite the fact the two products are essentially the same.

The effect's challenge to simple open economy models

The (naïve form of the) purchasing power parity hypothesis argues that the Balassa–Samuelson effect should not occur. A simple open economy model treating Big Macs as commodity goods implies that international price competition will force Norwegian, Egyptian, and U.S. burger prices to converge in price. The Penn effect, however, maintains that the general price level will remain consistently higher where (dollar) incomes are high.

How identical products can be sold at consistently different prices in different places

The law of one price says that the same item cannot sustain two different sale prices in the same market (since everyone would buy only at the lower price). By reversing this law, we can infer that different countries do not share an efficient common market from the fact that prices for the same good are different.

If a McDonald's patron in Oslo were able to eat in an identical Cairo restaurant at one quarter the price they would do so, and price competition would then equalize the Big Mac price throughout the world. Of course, someone can only eat out locally, so regional price differentials can persist; the Oslo and Cairo branches are not in competition. If the Cairo McDonald's starts giving away burgers the price in Oslo will be unaffected, since one is unlikely to dine in Cairo if starting the evening in Oslo, nor can one import an Egyptian meal into Norway by ordering take-out.

The price level

Measuring 'the' price level involves looking at goods other than burgers, but most goods in a consumer price index (CPI) show the same pattern; equivalent things tend to cost more in high income countries. Most services, perishable goods like the Big Mac, and housing cannot be purchased very far from the point of consumption (where the consumer happens to live). These items form the typical consumer shopping list, and therefore the consumer price level can vary from country to country, just like the burger price.

The international development implications

The deviation in Purchasing power parity allows rural Indians to survive on an income below the absolute subsistence level in the rich world. If the money income levels are taken as given, then all else being equal the Penn effect is a very good thing. If it did not apply, millions of the world's poorest people would find that their income was below the survival threshold. However, the effect implies that the money income level disparity as measured by international exchange rates is an illusion, because these exchange rates only apply to traded goods, a small proportion of consumption.

If the genuine income differential (taking local prices into account) is exaggerated by the market exchange rate, so the real difference in the standard of living between rich and poor countries is less than GDP per capita figures would suggest, if converted at market exchange rates. To make a more significant comparison, economists divide a country's average income by its consumer price index.

See also

Footnotes

1 For instance, economists in 1949 expected that one could buy similar quantities of meat in New York for one dollar as in Tokyo for 360 Yen, the pegged nominal exchange rate at the time. It was thought that deviations from this would mostly be caused by problems of supply, and the fact that exchange rates were not allowed to float to market levels by most of the world's central banks (before the 1970s and the end of the Bretton Woods era of gold convertibility).

References

  • Paul A. Samuelson (1994). "Facets of Balassa-Samuelson Thirty Years Later," Review of International Economics 2(3), pp. 201–26. (Abstract defining the Penn effect). (This issue has several papers discussing the effect.)

External links

  • 2004 Econometric study of the effect's rise since circa 1950 (their time series starts 1500 AD, with the Penn effect only noticeable 450 years into the data). The appendix contains a thorough (eight page) two country General equilibrium derivation of the effect's size based on the BS hypothesis across a continuum of industries, endogenously split between traded and non-traded production. However, the paper as a whole is focused on analysis of historical economic data.
  • - A direct 2003 comparison of Cassel's pure PPP-hypothesis and the Penn effect deviation at scales estimated by the BS-hypothesis (using data from sixteen industrialized countries). Surprisingly, this University of Houston study finds that industrialized countries tend to fit Cassel's hypothesis better (at a ratio of 2 countries to 1). This result can occur (despite an apparently clear correlation of income to price) because of the long reversion times expected by the PPP hypothesis.

January 21, 2023
penn, effect, economic, finding, that, real, income, ratios, between, high, income, countries, systematically, exaggerated, gross, domestic, product, conversion, market, exchange, rates, associated, with, what, became, penn, world, table, been, consistent, eco. The Penn effect is the economic finding that real income ratios between high and low income countries are systematically exaggerated by gross domestic product GDP conversion at market exchange rates It is associated with what became the Penn World Table and it has been a consistent econometric result since at least the 1950s The Balassa Samuelson effect is a model cited as the principal cause of the Penn effect by neo classical economics as well as being a synonym of Penn effect Contents 1 History 2 Understanding the Penn effect 2 1 The effect s challenge to simple open economy models 2 2 How identical products can be sold at consistently different prices in different places 2 3 The price level 3 The international development implications 4 See also 5 Footnotes 6 References 7 External linksHistory EditClassical economics made simple predictions about exchange rates it was said that a basket of goods would cost roughly the same amount everywhere in the world when paid for in some common currency like gold 1 This is called the purchasing power parity PPP hypothesis also expressed as saying that the real exchange rate RER between goods in various countries should be close to one Fluctuations over time were expected by this theory but were predicted to be small and non systematic Pre 1940 the PPP hypothesis found econometric support but some time after the Second World War a series of studies by a University of Pennsylvania team documented a modern relationship countries with higher incomes consistently had higher prices of domestically produced goods as measured by comparable price indices when compared at market exchange rates In 1964 the modern theoretical interpretation was set down as the Balassa Samuelson effect with studies since then consistently confirming the original Penn effect However subsequent analysis has provided many other mechanisms through which the Penn effect can arise and historical cases where it is expected but not found Up until 1994 the PPP deviation tended to be known as the Balassa Samuelson effect but in his review of progress Facets of Balassa Samuelson Thirty Years Later Paul Samuelson acknowledged the debt that his theory owed to the Penn World Tables data gatherers by coining the term Penn effect to describe the basic fact they uncovered when he wrote The Penn effect is an important phenomenon of actual history but not an inevitable fact of life Understanding the Penn effect EditFurther information Big Mac Index Most things are cheaper in poor low income countries than in rich ones Someone from a first world country on vacation in a third world country will usually find their money going a lot further abroad than at home For instance a Big Mac cost 7 84 in Norway and 2 39 in Egypt in January 2013 at the prevailing USD exchange rate for those two local currencies despite the fact the two products are essentially the same The effect s challenge to simple open economy models Edit The naive form of the purchasing power parity hypothesis argues that the Balassa Samuelson effect should not occur A simple open economy model treating Big Macs as commodity goods implies that international price competition will force Norwegian Egyptian and U S burger prices to converge in price The Penn effect however maintains that the general price level will remain consistently higher where dollar incomes are high How identical products can be sold at consistently different prices in different places Edit The law of one price says that the same item cannot sustain two different sale prices in the same market since everyone would buy only at the lower price By reversing this law we can infer that different countries do not share an efficient common market from the fact that prices for the same good are different If a McDonald s patron in Oslo were able to eat in an identical Cairo restaurant at one quarter the price they would do so and price competition would then equalize the Big Mac price throughout the world Of course someone can only eat out locally so regional price differentials can persist the Oslo and Cairo branches are not in competition If the Cairo McDonald s starts giving away burgers the price in Oslo will be unaffected since one is unlikely to dine in Cairo if starting the evening in Oslo nor can one import an Egyptian meal into Norway by ordering take out The price level Edit Measuring the price level involves looking at goods other than burgers but most goods in a consumer price index CPI show the same pattern equivalent things tend to cost more in high income countries Most services perishable goods like the Big Mac and housing cannot be purchased very far from the point of consumption where the consumer happens to live These items form the typical consumer shopping list and therefore the consumer price level can vary from country to country just like the burger price The international development implications EditThe deviation in Purchasing power parity allows rural Indians to survive on an income below the absolute subsistence level in the rich world If the money income levels are taken as given then all else being equal the Penn effect is a very good thing If it did not apply millions of the world s poorest people would find that their income was below the survival threshold However the effect implies that the money income level disparity as measured by international exchange rates is an illusion because these exchange rates only apply to traded goods a small proportion of consumption If the genuine income differential taking local prices into account is exaggerated by the market exchange rate so the real difference in the standard of living between rich and poor countries is less than GDP per capita figures would suggest if converted at market exchange rates To make a more significant comparison economists divide a country s average income by its consumer price index See also EditThe Economist s Big Mac Index consistently shows fourfold differentials in the burger s price Purchasing Power Parity is the situation in which RERs are 1 a nil Penn effect Footnotes Edit1 For instance economists in 1949 expected that one could buy similar quantities of meat in New York for one dollar as in Tokyo for 360 Yen the pegged nominal exchange rate at the time It was thought that deviations from this would mostly be caused by problems of supply and the fact that exchange rates were not allowed to float to market levels by most of the world s central banks before the 1970s and the end of the Bretton Woods era of gold convertibility References EditPaul A Samuelson 1994 Facets of Balassa Samuelson Thirty Years Later Review of International Economics 2 3 pp 201 26 Abstract defining the Penn effect This issue has several papers discussing the effect External links Edit2004 Econometric study of the effect s rise since circa 1950 their time series starts 1500 AD with the Penn effect only noticeable 450 years into the data The appendix contains a thorough eight page two country General equilibrium derivation of the effect s size based on the BS hypothesis across a continuum of industries endogenously split between traded and non traded production However the paper as a whole is focused on analysis of historical economic data G 20 ICP An analysis of the data in the International Comparison Program gives clear Penn effect examples Long Run Purchasing Power Parity Cassel or Balassa Samuelson A direct 2003 comparison of Cassel s pure PPP hypothesis and the Penn effect deviation at scales estimated by the BS hypothesis using data from sixteen industrialized countries Surprisingly this University of Houston study finds that industrialized countries tend to fit Cassel s hypothesis better at a ratio of 2 countries to 1 This result can occur despite an apparently clear correlation of income to price because of the long reversion times expected by the PPP hypothesis Retrieved from https en wikipedia org w index php title Penn effect amp oldid 981585553, wikipedia, wiki, book, books, library,

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