In the absence of trade, simon and dave each spend half their time producing beans and half their time producing corn. suppose simon and dave specialize and that the terms of trade are 1 pound of green beans for 1 pound of corn. if simon sells dave 80 pounds of green beans, then the gains from trade for simon are pounds of green beans and pounds of corn with trade and specialization.
a: apartment building
i think you have to let the moderators that you want your old account to be activated.
107x106 is the answer
reducing the scale of the market for a new product.