Suppose the government were to replace the income tax with a consumption tax so that interest on savings was not taxed. the result would be that the interest rate

a. and investment both would increase.

b. and investment both would decrease.

c. would increase and investment would decrease.

d. would decrease and investment would increase.

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?