Sorry Ikki and Max, you're both wrong and honestly acting childish.
Neither of you are able to manipulate the market, and it's pretty stupid to suggest that it's possible via PC.
Surge is right about basically everything he posted (other than a Pokémon being better than GW). The reality is that the only legit example of market manipulation is (1) hoarding of Q8 caster swords/axes from a couple years ago, and potentially (2) botting of Canthan staves. Market manipulation, if possible in his game, is only able to be done via selling. That way the ones that control the supply (via hoarding or botting) can set prices for the items. There are probably other examples of hoarding/artificially limited supply, but none have ever had actual demand to pair with them (for example dual reduc, caster shields or hammers).
Current market conditions have very little to do with either of the people arguing here, so take it somewhere else.