In fact I changed the server-wide economy a while ago, back in vanilla WoW. I was an Alchemist and Major level potions were the highest. I had a few stacks of Superior potions that I had been bouncing off of the AH for a while. I was tired of them not selling, so I priced them a little higher than the competition, and then bid on all the competition with long durations. I did this for a week or two and the natural price started to rise. It was a win/win situation for me. If someone bought my potion, they were buying at a higher market price and I got the money. If somone sold a potion for less than that and I bid it up, I would get the potion to resell at a slight loss (the difference in my price vs their price), or if someone else outbid me, they would buy the potion for even more than the price I was charging, and I would get my cash back... but it enforced the higher price.

After a couple weeks a guildie began supplying me with mats for the Superior Health potions and I gave him a cut. I would normally post about 5 to 10 stacks of potions daily, and easily a page or two on Thursday through Saturday. I was making about 20 to 50 gold a day, on average for the week. I also started selling Major Healing potions as well as the herbs for both.

After a little whlie people started posting as many potions as they could at extremely low prices so I couldn't bid them all up. So... I Bid the minimum and let the market crash. I picked up scads of potions for very cheap, in many cases below half the current market price, and in some cases even less than the cost of the vial to make them. Then I let the market stabilize, and I started selling my huge oversupply for regular price.