As long-time readers of this blog know, I think that argument is weak at best. The Fed has not been printing money with its Quantitative Easing programs. The Fed has simply been swapping bank reserves (which are functionally equivalent to T-bills) for notes and bonds, and they have been doing this in size in order to accommodate the world's demand for safe assets. The Fed hasn't been dumping tons of new money into the system, the Fed has been supplying liquidity that the market demanded. We haven't seen any unusual increase in inflation because the Fed's supply of money has been equal to the demand for money.
But even if the Fed were "pumping" money into the economy, it's a stretch to think that extra money can translate real growth. If printing money could make an economy grow, Zimbabwe and Argentina would be economic powerhouses—but they aren't. Printing money that no one wants is the basic recipe for inflation, and that's not been the story of the current business expansion in the U.S. economy.
Here are some charts that focus on the physical growth of the U.S. economy. This is real growth, not make-believe, liquidity-driven growth.
Manufacturing production (the volume output of industrial establishments in mining, quarrying, manufacturing, and public utilities) has increased by 25% in the past five years. It's almost at a new all-time high. The manufacturing side of the economy survived, and has largely recovered from, its steepest plunge in history.
Actual shipments by truck, rail, waterways, pipelines and aircraft, as measured in ton-miles by the Dept. of Transportation, has increased over 25% in the past five years, and is now at a new all-time high.
Truck tonnage, as measured by the American Trucking Association, has increased by almost 30% in the past five years and is now very close to its all-time high. As the above chart shows, there is a decent correlation between the level of truck tonnage and the real value of the equity market. When the physical size of the economy increases, so do equity prices in real terms. Furthermore, equity prices do not appear excessive when compared to the increase in the physical size of the economy. (They did look excessive in 2000, however, and they looked extremely depressed in 2009.)
The nation's architectural firms report an increasing number of billings, a good sign that the commercial real estate market is expanding.
New housing starts are up about 80% in the past five years, and builders appear reasonably confident that construction activity will continue to increase.
U.S. exports of goods have increased 65% in the past five years and are at a new all-time high.
World trade volume has increased almost 35% in the past five years, and is now at an all-time high.
U.S. crude oil production has surged over 70% in the past five years, with the result that the U.S. has surpassed Saudi Arabia as the world's largest oil producer. Back in 2008 this would have been unthinkable, and it's all due to the ingenuity of oil producers (i.e., fracking technology).
A composite index of chemical industry activity has increased 27% in the past five years, and has grown by 4.3% in the year ending June 2014—a good indicator that the U.S. economy continues to grow.
The private sector has created almost 10 million jobs in the past four years, and private sector jobs are now at a new all-time high.
The jobs market is stronger and unemployment is lower primarily because fixed investment (e.g., investment in new things—new buildings, new homes, new plant and equipment) has increased faster than the overall economy.
There's still a lot of room for all of these indicators to improve. It's still the case that this has been the weakest recovery in history. But it is nevertheless a recovery, and the economy has without question been growing in a real, physical sense. This is a genuine economic expansion, and the rise in equity prices is a reflection of that growth. It's not a liquidity-driven mirage, it's real.