As 'Austrian' business cycle theory has pointed out, any bank credit inflation sets up conditions for boom-and-bust; there is no need for prices actually to rise.
Play, as a consumers' good, is subject to the law of marginal utility, as are all goods, and the time spent in play will be balanced against the utility to be derived from other obtainable goods.
Subjectivism is not an absolute principle; it is a necessary but not sufficient condition for sound methodology.
As Ludwig von Mises conclusively demonstrated in 1912, money does not and cannot originate by order of the State or by some sort of social contract agreed upon by all citizens; it must always originate in the processes of the free market.
The 'boom-bust' cycle is generated by monetary intervention in the market, specifically bank credit expansion to business.
Fractional reserve banks are sitting ducks and are always subject to contraction. When the banks' state of inherent bankruptcy is discovered, for example, people will tend to cash in their deposits, and the contractionary, deflationary pressure could be severe.
On the market, all is harmony. But as soon as intervention appears and is established, conflict is created, for each may participate in a scramble to be a net gainer rather than a net loser - to be part of the invading team instead of one of the victims.
We have gotten to the point where everything the government does is counterproductive; the conclusion, of course, is that the government should do nothing at all, that is, should retire quickly from the monetary and economic scene and allow freedom and free markets to work.
The contemporary political scientist believes that he can avoid the necessity of moral judgments and that he can help frame public policy without committing himself to any ethical position.