By CHRISTOPHER S. RUGABERWASHINGTON (AP) â¿¿ The number of Americans seeking unemployment aid fell last week to seasonally adjusted 324,000, the lowest since January 2008. The drop points to fewer layoffs and possibly more hiring. The Labor Department said Thursday that weekly applications fell 18,000, the second straight sharp drop. The four-week average, a less volatile measure, plummeted 16,000 to 342,250, close to a five-year low. Applications are a proxy for layoffs. When they fall below 350,000, it is generally consistent with moderate hiring. But layoffs are only half the equation: Companies also need to be confident enough to add workers for job growth to pick up and lower the unemployment rate. Many have held off adding new workers in recent months, possibly because of concerns about the impact of federal spending cuts and tax increases. Economists forecast that the economy added 160,000 jobs last month. That's much better than the 88,000 added in March, but below last year's pace of nearly 185,000 per month. The unemployment rate is expected to remain unchanged at 7.6 percent. But many have lowered their estimates this week, some as low as 120,000, after several reports suggested that slower growth is dragging down hiring. The government will release the April employment report Friday. The spending cuts, known as sequestration, and higher Social Security taxes may be making businesses more cautious about hiring. And the tax increase could slow consumer spending. The Federal Reserve said Wednesday that those policies are "restraining economic growth." "We think hiring will be more subdued in the second quarter as the economy weathers a consumer spending slowdown and sequestration job cuts," said Julia Coronado, an economist at BNP Paribas. Unemployment benefit applications "will not capture either of these developments." One reason layoffs may not rise is that federal agencies are cutting hours, rather than jobs.