Runescape economics

I am studying higher economics at university so I've got decent knowledge about economics.
Now, I was wondering how I could apply what I've learnt to the economics of Runescape, more specifically on economics of the smaller private server (with an average of 100-200 online players at all times and a grand-exchange).
I've read all about the merchanting methods and guides about economics of RS3 and RS07, like price manipulation, pump and dump and stuff, but I've experienced you can't make big profits with those methods on smaller servers. So I was wondering how I could manipulate markets and stuff.
Could it be possible for 1 player to cause an inflation, a market crash or just other ways to make some profits and have some minor control over the economy?

Do you think it could be done and how so? What are your toughts on this?

 

As with smaller private servers, liquidity would be a problem as there wouldn't be many buyers and sellers. This would mean there wouldn't be many price crashes as a result of pump and dump stuff .. you would need heaps of sellers selling in a short of period of time (or buyers buying). I would expect artificially raising prices of uncommonly used items to work on these servers though by having two accounts, one selling at a higher price, the other buying it and then increasing the price.