k) accounts plunging. investors getting rid of stocks and bonds sent the dow falling nearly 354 points. abc's devon da wiper join us live from washington, d.c. to explain what's behind this wall street shakeup. good morning, devon. >> reporter: hey, good morning, katie. after that huge selloff yesterday, u.s. stock futures rose overnight. experts are telling us to get used to these ups and downs. it's shaping up to be a volatile summer on wall street. it's been a turbulent week for american 401(k)s and it's not over yet. overnight, markets in europe and asia bounced back from heavy losses, one day after wall street saw its worst day all year. >> it's like a perfect storm out there this week. >> reporter: investors say the storm is, in part, because of some good news about the economy. last month, employers added 175,000 new jobs with unemployment expected to fall below 7% next year. existing home sales are also picking up, posting their best month in 3 1/2 years. but recovery from recession mean he is the federal reserve could pull back on its stimulus pro, which has pumped billions into the system to help drive growth. >> our economy is getting better and now it's time for us to se