Which of the following is true of accounting for changes in estimates?

a. A company recognizes a change in estimate by making a retrospective adjustment to the financial statements
b. Changes in estimates are not carried back to adjust prior years
c. A company accounts for changes in estimates only in the period of change, even though it affects the future periods
d. Changes in estimates are considered as errors or extraordinary items

Asmartphone manufacturing company uses social media to achieve different business objectives. match each social media activity of the company to the objective it the company achieve.

Factors like the unemployment rate, the stock market, global trade, economic policy, and the economic situation of other countries have no influence on the financial status of individuals. ( t or f)

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?