Is "sound money" good for the economy?

Again and again I read about sound money and how things would be better with a currency that holds its value, or better yet, appreciates in value over the years. Such as the gold bullion. But would that be such a good thing? If the currency appreciates by 6% P.A all buisness ventures that would rake in less would get shot down from the get go. People would hold on much more to their cash than they already do.

How is a currency that depreciates over the years and therefore entices investing that currency, which in turn resluts in tangible values, like products and services, bad for the economy? It is bad for the safer, but how is it bad for the economy? Would you pay somebody in gold to mow your lawn?