As the title says, what would be the effects on bitcoin if the US economy crashed?
Would there be a sharp rise, as lots of people would want to move their money out of the dollar and into something else, or would the price drop, as a large fraction of the bitcoin community is American?
There would most likely be a very sharp rise in the value of Bitcoin, Precious Metals, and other currencies. At the point where the USD is crashing, everyone is using any means to save their wealth. This means, if they can figure out how to use Bitcoin, they will most certainly be plowing through the exchanges trying to transfer their wealth.
As for the current Bitcoin users, I doubt they would dumb their BTC unless life required it. They would at most use it for life expenses, however aside from that they would most likely intend on holding their Bitcoin as it is one of the few ways for them to preserve their wealth.