NEW YORK --Economists may be debating when the recession ended, but small business owners report little pick up in their sales or confidence in March, according to a report released Tuesday. The weak readings explain why small businesses remain reluctant to hire. The Small Business Optimism Index lost 1.2 points to 86.8 in March, said the National Federation of Independent Business. The NFIB noted that nine of the 10 components declined or failed to contribute to an increase in the top-line index. The lone improvement came in the subindex covering expected business conditions. It rose 1 percentage point to -8%. The report said 34% of respondents said "weak sales" were their top business problem. The subindex on earnings trends fell 4 points to 43%, and sales expectations subindex dropped 3 points to -3% in March. The lack of revenue may be holding back job growth. The March employment index fell 1 point to -2%. The NFIB said businesses may be finished with layoffs, but companies will only add workers if owners think "new hires can generate enough additional business to pay their way." Earlier in April, payroll giant ADP reported that its jobs survey showed small businesses--with 49 or fewer employees--cut 12,000 jobs in March. Weak sales are also leading to inventory reductions. The inventory index was flat at -7%, and the NFIB said more firms cut stockpiles than added to them in March. Inflationary pressures were nearly nonexistent last month. Seasonally adjusted, the net percentage of owners raising prices was -20%, up one point from February. The drop in confidence among small business owners comes as economists are debating when the recession ended. The National Bureau of Economic Research said Monday it was still "premature" to set a date for the economy's trough. The NFIB reports suggest that while the overall economy is growing, pockets of pessimism remain.