It seems a little inflation, (things being cheaper to buy today than next month), is not a bad thing. 2 percent is a pretty low inflation rate. This has to do with the fact that ideally, the economy should always be expanding at a rate greater than the inflation rate.
Deflation, (things being cheaper next month than now), is usually a very bad thing, business slows down because investors and entrepreneurs simply don't buy because they know that something will be cheaper in the future. As a result, businesses don't expand or invest, since they can do it cheaper next month, or the month after. With a small amount of inflation, businesses are encouraged to go ahead and expand and hire people, since if they do it now they will pay less than if they do it tomorrow.
Inflation being exactly zero is too close to deflation, which kills economic expansion. You want a one or two percent "buffer" between the present rate of inflation and going into a state of deflation.