Say you have $10 trillion USD in total money in your economy (about what it currently is sitting at, this is M3 for reference) and $15 trillion GDP, 2010 dollars. 10 years later, you have a $20 trillion money supply and $30 trillion GDP, 2010 dollars. Money supply went up? Did price levels rise? NO. Price levels don't matter. It's all about real income (also known as real purchasing power). As for fixed value goods from shops, the higher price levels only benefit EVERY player. Runes from a store are relatively cheaper now -> higher real purchasing power -> higher utility. What I meant by stable was the prices of goods have leveled out. NOT that manipulations on individual items don't temporarily cause instability in that particular item's market. The long term trend of the economy overall is now stability. Here's a bad real life example, remember those beanie baby toys? For a while they were "bought out" - it was hard to purchase them because collectors/crazy people were buying them all for seemingly absurd prices. I believe the going price for a Princess Diana? doll was easily $100. The prices were sky high! But was the US economy experiencing inflation (above the typical inflation accompanying growth)? No. Changing money supply is not intrinsically bad. As you said, you should be tight during inflation and loose during deflation. However, since Runescape's economy is currently stable, NEITHER should be applied. Having larger numbers in your bank is not a problem. Remember: real purchasing power is what is of concern. What is problematic about someone buying herbs for high prices? The buyer obviously is willing to pay the price, otherwise he/she would not pay for it. The seller obviously is willing to accept the price, otherwise he/she would not sell it. The high price is just what it is worth.