Brad DeLong on the use of finance

Brad DeLong

Of course, investors who believe that their wealth is securely liquid, and that they are adding value for themselves by buying and selling are suffering from a delusion. Our financial wealth is not liquid in an emergency. And when we buy and sell, we are enriching not ourselves, but the specialists and market makers.

But we benefit from these delusions. Psychologically, we are naturally impatient, so it is good for us to believe that our wealth is safe and secure, and that we can add to it through skillful acts of investment, because that delusion makes us behave less impatiently. And, collectively, that delusion boosts our savings, and thus our capital stock, which in turn boosts all of our wages and salaries as well.

Seventy-three years ago, John Maynard Keynes thought about the reform and regulation of financial markets from the perspective of the first three purposes and found himself "moved toward... mak[ing] the purchase of an investment permanent and indissoluble, like marriage...." But he immediately drew back: the fact "that each individual investor flatters himself that his commitment is ’liquid’ (though this cannot be true for all investors collectively) calms his nerves and makes him much more willing to run a risk...."

Moreover, for Keynes, "[t]he game of professional investment is intolerably boring and over-exacting to anyone who is entirely exempt from the gambling instinct; whilst he who has it must pay to this propensity the appropriate toll...."