1.   Air pressure is intentionally left very low to allow them the greatest traction.

2.   Inflation remained tame during the first quarter, according to the report on Friday, giving the Fed greater flexibility to leave rates low without worrying about spiraling prices.

3.   Labor costs also fell, taking the heat off inflation and giving the Fed even more leeway to leave rates low.

4.   Soybeans also rose, reaching their highest price in a year after the USDA said increased demand for exports will leave inventories low as well.

5.   Even with a plentiful harvest, however, current demand will leave stockpiles low through next year.