Sure, but some forms of undercutting causes the equilbrium price to be reached faster than other forms of undercutting. Putting 2.5% posting tax, 2.5% readjusting tax and 2.5% sell tax, instead of having just a 5% tax like now, will eliminate the 1-gil undercutting strategy and make all prices reach the equilibrium price faster.
Currently in far too many markets, 1-gil undercutters are keeping the prices up higher than the equilibrium price. The proof is: if the price around where 1-gil undercutters sell was the true equilbrium price, then they wouldn't have to keep 1-gil undercutting, because at that point the supply is the same as the demand and both the 1-gil undercutter's goods and the 1 gil above him would sell. The reason they keep 1-gil undercutting each other is because the price is above equilibrium price and only the part of the supply that happens to show furthest up on the list despite being practically the same price would sell.
Read my thread at http://forum.square-enix.com/ffxiv/t...really-fix-it. for a more elaborate explanation.
http://forum.square-enix.com/ffxiv/f...-and-Retainers
As long as the prices are above the equilibrium price, they will keep undercutting each other, yes. If the price goes below the equilibrium price, you no longer need to undercut, because putting at a slightly higher price that is a bit higher but still below the equilibrium price would still sell.
A good example of a market where you don't want to keep undercutting at all times: many Elemental materia markets. Because at low enough price (which happens a lot on Phoenix), it will go below the equilibrium price and at that point people will buy them simply to speed up their soul-binding for materia-conversion. For instance there is a far higher demand for Earth III materia at 5 gil than there are Earth III materia on the server.
By introducing the readjusting fee at 2.5% as well as posting fee at 2.5% and changing sell fee to 2.5% from current 5%, 1-gil undercutting is eliminated as strategy. This will speed up the path towards equilibrium price. Few large jumps can get further than many small ones; specially in the case of the small 1-gil undercut jumps, the equilibrium price takes forever to be met.


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