Long-term aggregate supply (LAS) gives the representation of the potential output and the relationship between the price level and output in the long-run. The input prices are not constant. The changes in aggregate demand only cause a temporary change in an economy's total output, so the long-run aggregate supply curve is perfectly vertical. In the long-run, there is exactly one quantity that will be supplied. The changes in resource prices is not LAS, but short-term aggregate supply, because depends on the price of the input.