Why do you think economist can be certain that every expansion in the economy will be followed by a peak and then a contraction?

What are that three unifying characteristics of chordates

In a planned economy, which of the following does the job of market forces in order to determine the outcomes?

Which is the main inference that can be drawn from adam smith's book the wealth of nations? a) for an economy to work flawlessly, it shouldn't have to serve and moral goals. b) the government must control a free-market economy, or economic problems will arise. c) a free-market economy works well only without the government's interference. d) free trade will only hurt economies and should be stopped by governments.