Afall in the value of the dollar against other currencies makes u. s. final goods and services cheaper to foreigners even though the u. s. aggregate price level stays the same. as a result, foreigners demand more american aggregate output. your study partner says that this represents a movement down the aggregate demand curve because foreigners are demanding more in response to a lower price. you, however, insist that this represents a rightward shift of the aggregate demand curve. who is right? explain.

Google started as one of many internet search engines, amazon started as an online book seller, and ebay began as a site where people could sell used personal items in auctions. these firms have grown to be so large and dominant that they are facing antitrust scrutiny from competition regulators in the us and elsewhere. did these online giants grow by fairly beating competition, or did they use unfair advantages? are there any clouds on the horizon for these firms -- could they face diseconomies of scale or diseconomies of scope as they continue to grow? if so, what factors may limit their continued growth?