Exchange-traded funds offer a convenient way to invest in sectors or niches that interest you. If you expect medical devices companies to thrive as our population ages and needs products and procedures such as stents and pacemakers, the iShares Dow Jones US Medical Devices ETF (NYS: IHI) could save you a lot of trouble. Instead of trying to figure out which companies will perform best, you can use this ETF to invest in lots of them simultaneously.
