Rina is training for a triathlon, a timed race that combines swimming, biking, and running. consider the following sentence: rina has only 20 hours this week that she can devote to training. each hour she spends swimming is an hour that she can't spend biking or running. which basic principle of individual choice do these statements best illustrate? a: rina can use time most efficiently by spending the same amounts of time on swimming, biking, and running. b: people face trade-offsc: people usually exploit opportunities to make themselves better off. d: rina has an incentive to spend more time on swimming than on biking or running.

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All of the following led to the collapse of the soviet economy except a. a lack of worker incentives. c. inadequate supply of consumer goods. b. a reliance on production quotas. d. the introduction of a market economy.

About 20 years ago, sturdy light, inc., produced a sturdy, lightweight backpack in a market that was rapidly growing. sturdy light became a leader in this market. eventually, the backpack market reached the maturity stage and slowed down. however, by this time, sturdy light had developed a strong brand name and continued to steadily lead the market. which of the following describes this scenario? a. sturdy light was a star that developed into a cash cow. b. sturdy light was a question mark that developed into a star. c. sturdy light was a dog that developed into a question mark. d. sturdy light was a cash cow that developed into a star.