The great real estate Chicago BUBBLE, which burst in 1873, wasn't due to banks issuing more credit than they had gold to back it up with and the ensuing recession came on the heels of that bust BUBBLE.
The Panic of 1836-37 had nothing whatsoever to do with credit or loans. Like many other panics, recessions, and depressions, world affairs are involved.
And then, there have been the speculators, who have tried to or actually did "corner the market" on different commodities, which have fueled manias and then recessions and depressions.