Some of society's most intractable problems come not from its failures but from its successes. Often you can't get a good thing without paying a bad price.
A prime example is our public old-age pension system, Social Security. It has been completely successful in wiping out poverty among the elderly. Old ladies no longer have to eat cat food to survive.
But we pay some prices for this. One is a lower savings rate. China has a humongous savings rate in part because it has no reliable old-age pension system. People have to save if they don't want to starve.
In the United States, we got out of the habit of saving. In the decade up to the financial crash of 2008, the U.S. savings rate fell below zero.
We felt comfortable borrowing on the supposedly ever-increasing values of our houses to support current and sometimes lavish consumption. Now we're paying the price.
But even if our savings rate rises back to the level of, say, the 1980s, it still may be lower than optimal.