
The Balassa–Samuelson effect, also known as Harrod–Balassa–Samuelson effect (Kravis and Lipsey 1983), the Ricardo–Viner–Harrod–Balassa–Samuelson–Penn–Bhagwati effect (Samuelson 1994, p. 201), productivity biased purchasing power parity (PPP) (Officer 1976) and the rule of five eights (David 1972) is either of two related things: ...
Found on
http://en.wikipedia.org/wiki/Balassa–Samuelson_effect

The hypothesis that an increase in the productivity of tradables relative to nontradables, if larger than in other countries, will cause an appreciation of the real exchange rate. Due to Balassa (1964) and Samuelson (1964).
Found on
http://www-personal.umich.edu/~alandear/glossary/b.html
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