Under the deemed substantiation method of accounting for expenses, what is the maximum amount taxpayers are allowed as a deduction without being required to substantiate the amount of the expenses? a. The per diem rate established by the state in which they live. b. The appropriate Federal per diem amount. c. All expenses up to $25 per day. d.$75 per day. e. None of these choices are correct.

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?