What does it take to influence the market of an altcoin? Buying a big amount of the total circulating supply from 1 exchange wouldn't work right? Or does the price go up while buying that big amount? To get that to happen the exchanges would have to look at eachothers prices right?
It's all supply and demand.
When demand goes up but supply goes down, price goes up.
So, yes, whales can manipulate the price of any coin just by buying lots of it.
But they then have to purchase the coin from different exchanges right? Or do all exchanges share the same exact price? Last time I checked they had slight differences.