NEW YORK - Don't look away for too long. You might miss a market rally. Or a plunge.

The Dow Jones industrial average is up 80 points after beingdown as many as 245 points on Friday. It had been up by as many as171 points after a solid jobs report in the morning.

Many investors fear that Europe's spreading debt crisis mightreach U.S. banks and threaten the fragile economy. A stronger jobsreport early Friday did little to reassure investors, a day afterthe Dow's worst decline since 2008.

Among the issues investors are most concerned about: Europe'sgrowing financial crisis; hiring in the U.S. that is too slow tosignificantly lower the unemployment rate; anemic growth inmanufacturing and the service sector and a decline in consumerspending; and the belief that the government is unlikely to spendmore to stimulate the economy.