Economists often are interested in percentage change from one period to the next. the percentage rate of change of gross domestic product (gdp) is an important macroeconomic variable. if in 2010 gdp was $11,150 billion dollars, and gdp increased to $11 comma 78011,780 million in 2011, what is the growth rate of the u. s. economy in 2011?

Rossdale co. stock currently sells for $68.91 per share and has a beta of 0.88. the market risk premium is 7.10 percent and the risk-free rate is 2.91 percent annually. the company just paid a dividend of $3.57 per share, which it has pledged to increase at an annual rate of 3.25 percent indefinitely. what is your best estimate of the company's cost of equity?

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?

Communication comes in various forms. which of the following is considered an old form of communication? a) e-mail b) letter c) skype d) texting