00275nam a2200109Ia 4500082002100000100002100021245007100042300001600113490001400129490001700143500000500160  a382.60931 B499b  aBergstrom, A. R.  aEconometric study of supply and demand for New Zealand's exportsb  app. 258-276  vJuly 1955  aEconometrica  a