Save money to invest in what? Nobody is doing anything!
To do anything other than speculating on the Federal Reserve's monetary inflation and the asset bubbles which it caused by its reckless actions over the past few decades, that is, anything other than flipping homes and stocks. Nobody is doing anything because our manufacturing base has been gutted and our jobs shipped overseas, yet we've been fed the mantra that if we merely spend more our prosperity will continue in perpetuity. Those chickens are coming home to roost, and it won't be pretty.
In a downturn, the logical thing for individuals, families, and companies to do is to cut expenses, hunker down, and try to save money to ride out the recession.
There hasn't been a downturn so much as a collapse in credit. The consumer cannot use her home as an ATM anymore, and is running out of lenders to finance her consumption. While subsidized public sector interest rates are low, credit-worthy borrowers in the private sector can't get loans to do business. The involuntary response to this credit collapse, is for the consumer to spend a lot less, whether you like it or not.
If an individual does decide to spend money to stimulate the economy, the stimulative effect of this money gets distributed across the economy and the individual will get virtually nothing back himself. So there is no benefit to an individual spending money unless they absolutely have to.
What? Since when do individuals spend money to "stimulate the economy"? They spend because their purchases are worth more to them than that portion of their savings, or the cost of the credit required to make the purchase. At the risk of stating the obvious, the benefit of spending is what you receive in exchange.
But if everybody saves as much as they can, then the recession will last much longer. That’s the Paradox of Thrift. Everyone trying to save money leads to an economy where there is much less money flowing around and everyone is worse off. Rational individual behavior leads to an irrational collective outcome.
Economic recession is the liquidation of bad investments. In order for the economy to heal and recover from a multi-decade inflationary credit binge, all of the prior bad investments must be liquidated. The "Paradox of Thrift" presumes that saving is bad, and thus bad investments must be propped up and perpetuated, which is exactly what is happening now. The consumer rightly realizes that their credit line has run out, and that they, unlike Wall Street banks, don't have an unlimited line from the Fed or the Bank of China.
The basic principle of Keynesian economic policy is that when a situation like this arises, the government should step in to artificially generate demand and spur economic growth because it’s not in anybody else’s interest to do so. Once the economy is moving again, the government should step back and start saving up money and resources for the next recession.
Except, it was the Keynesians that caused all of this in the first place with a massive expansion of credit during the boom phase. We don't need artificial demand right now, artificial demand will result in the expropriation of the saver/investor, and the propping up of the fraudulent, the corrupt, and the incompetent. Given the track record of the Keynesians during the boom phase, it's hard to take any future promises of fiscal and monetary restraint seriously.