In 2007, investments in risky US mortgages went sour as homeowners struggled to pay. Funds run by Bear Stearns, BNP Paribas and other banks either had to freeze the ability of investors to take out their money, or liquidate the funds completely.
backstory is that i try to fill up my tank more when gas prices are at a low and less as prices go up to make my long term average cost per gallon lower.