Explain how inflation is sometimes beneficial to the society

Although the economic effects of inflation are primarily negative, two countervailing points are worth noting. First, the effect of inflation will differ considerably according to whether it is creeping up slowly at 0–2 percent per year, galloping along at 10–20 percent per year, or racing to the point of hyperinflation at, say, 40 percent per month. Hyperinflation can rip an economy and a society apart, but an annual inflation rate of 2 percent or 3 percent or 4 percent is a long way from a national crisis. Second, it is sometimes argued that moderate inflation may help the economy by making wages in labor markets more flexible. (Elaborate a little; nominal wages tend toward downward rigidity, but gradual inflation "nips" at nominal wages, causing gradual declines in some real wages that are desirable from an economics perspective.)