No, what you’re missing here is that about 4 years before the crash, American banks ran out of good customers. Everyone with a credit score over 700 that wanted a house had a house.
In Canada, when this happens, the banks stopped issuing more loans. They see no need to expose themselves to the risk of bad mortgages, why, because they hold onto those loans. They don’t actually want or need more mortgages. The flip side of this equations is that because banks hold onto mortgages, they recognize a finite pool, and go after the best borrowers.
But in the US, the banks were okay lowering their standards further and further. Why? Because US banks don’t hold on to mortgages the way Canadian banks do. They bundle them up and sell them to Federally regulated banks like Freddie and Fanny.
What we should all ask now is, “who would buy bad mortgage?” The answer is quite simple, no one.
Wait, no one, so why were they bought?
Because banks were able to bundle them with other mortgages, get a fake/fraudulent rating applied to them, and pass them off a good mortgages, then start again issuing more loans to worse customers.
It was a giant ponzy scheme that no one cared about until housing prices stopped going up, and that’s where the fun starts.
All those mortgages issued over the previous four years were done so on the assumption that house prices would keep going up, and that interest rates wouldn’t. So people were getting 4 and 5 adjustable rate mortgages* (with extremely low rates), with zero down, and above the listed value of the house. They were told the house value would go up, and they could refinance at a lower rate, using the new equity. And why not, it worked for the previous few years.
So now, two things happened. [1] When prices stopped going up, and interest rates did go up, people couldn’t refinance, and suddenly faced foreclosure. And this wasn’t just the sub-primes. But this led to [2] the high rated mortgage backed securities started to get hit by the foreclosures. People then realized that sub-prime loans were mixed in with prime loans. The result here was that ALL of the mortgage backed securities were called into doubt. No one had any confidence in any of them.
This was kicked off by a French financial company announcing that they didn’t trust these securities.
With all these in question, no one would dare buy new ones, so the flow of liquidity that you mentioned stopped dead. Now banks were stuck holding the hot potato (shitty loans they expected to get rid of) and began folding.
As more home owners weren’t able to refinance and went into foreclosure, the price of houses started to fall even faster. And so on and so on.
Why is all this relevant? Because capitalism couldn’t do anything at this point. Like a locust population that ate everything available, the only thing left to do is die.
It took socialist policies to try and stop the slide.
*again, there is a huge difference between mortgages in Canada and the US, you probably didn’t know that.