david bianco recommends buying shares of u.s. companies that make much of their profits overseas. >> the ones i like the most within the s&p are the ones with the most global exposure-- technology, energy, industrials, materials. those four sectors, they're more sensitive to the global economy than they are to the u.s. economy. >> reporter: while they may disagree in their forecasts, these strategists warn markets will be volatile. some are worried about what will happen when the federal reserve stops buying bonds, withdrawing support for the economy. there's also the possibility of the return of european debt concerns. >> obviously, they haven't gone away. and i think really, in 2011, we are going to continue to see more volatility caused by foreign issues, like sovereign debt in europe. >> reporter: but for tonight, there's reason to celebrate. the end of 2010 marks the largest three-year advance for stocks in over a decade with a more than 50% increase in that time. erika miller, "nightly business report," new york. >> tom: he