Which of the following is not a fungible commodity?

Suppose the price of a product increases from €50 to €70 and the quantity supplied rises from 40 a day to 80. What is the Price Elasticity of Supply?

a) 0.5. b) -0.5. c) 2.5. d) -2.5.

Every president who has held office since the General Agreement on Tariffs and Trade was signed has

A. argued for free-trade policies, but only Kennedy and Carter successfully resisted all calls for protection from various sectors of the economy. B. argued for free-trade policies, yet each one has used his powers to protect various sectors of the economy. C. argued for free-trade policies, but only Eisenhower and Reagan successfully resisted all calls for protection from various sectors of the economy. D. argued that certain domestic industries deserve protection, yet each one has been reluctant to use his powers to protect individual sectors of the economy.