Watch the 20-Year Treasury Bond ETF (TLT) if you want to have a good idea where the overall market is going. In times of uncertainty in US or overseas markets, money flows into US Treasury Bonds for safety. This drives up the price of bonds (TLT) and drives the yield lower. Treasury bond yields are now inverted with longer term bonds paying a lower yield than very short term treasury bills. This inversion worries the markets as a sign of a potential oncoming recession. This situation can push that markets lower. So watch bonds to know where the markets may move next.