Bank or bust: What on earth is going on with the US stock market?

If you’ve been closely following the big swings in the US stock market recently, you’ll be forgiven for feeling a little motion sick. Volatility has been the name of the game over the past three trading days, in moves mirrored here by the S&P/ASX 200 Index (ASX: XJO). Last Thursday, the S&P 500 Index (SP: .INX)…