We don’t have alternative universe laboratories to run control bailout experiments, but we can imagine the alternative outcomes if different actions were taken.
So let’s do just that. Imagine a nation in the midst of an economic crisis, circa September-December 2008. Only this time, there are key differences: 1) A President who understood Capitalism requires insolvent firms to suffer failure (as opposed to a lame duck running out the clock); 2) A Treasury Secretary who was not a former Goldman Sachs CEO, with a misguided sympathy for Wall Street firms at risk of failure (as opposed to overseeing the greatest wealth transfer in human history); 3) A Federal Reserve Chairman who understood the limits of the Federal Reserve (versus a massive expansion of its power and balance sheet).
In my counter factual, the bailouts did not occur. Instead of the Japanese model, the US government went the Swedish route of banking crises: They stepped in with temporary nationalizations, prepackaged bankruptcies, and financial reorganizations; banks write down all of their bad debt, they sell off the paper. Int he end, the goal is to spin out clean, well financed, toxic-asset-free banks into the public markets.