This is obviously bad (why else would a decline in the price of consumer products be bad?) because falling prices lead to falling profits, which lead to defaults on debt and bankrupcies, which lead to layoffs, which finally leads to a decrease in demand as the economy slowly cannibalises itself to make up for diminishing returns.
You might say "this is fine, the USA can get out of this by throwing money into the economy and propping up Boeing so it can buy more of its own stock" by arguing that what FDR did during the great depression worked, but even under FDR the US economy's recovery was temporary and gave way to a very sharp slump after a few years of the New Deal. It was so bad that a lot of people at the time actually thought FDR was hurting the economy - Fortune's Roper poll found in May 1939 that 39% of Americans thought the administration had been delaying recovery by undermining business confidence, while 37% thought it had not. The US economy only really recovered during WW2, when they were given a reason to manufacture a bunch of shit and ship it across the Atlantic. Of course, there's also way, way more debt that's never going to be repaid than there was in 1929 and 1938, so it seems like if anything it should be harder to unfuck the coming economic situation.
What does the next decade even look like? What should policymakers even do about this?