Jurgen Klopp suggested clubs must adapt to the rising cost of transfers.
Liverpool spent a world record £75 million on Virgil van Dijk.
Speaking about the transfer market at news conference on Friday, Klopp said: "I'm surprised about the development in the last two years, let me say, because there were big steps.
"But the last half a year changed pretty much everything and we, as a club, cannot change that.
"Of course, not each club would be able to do it, but a lot of clubs are able to do it and will do it in the future. How the market always is, it's all about the need and the opportunity.
"If you want to sign a player, the last thing I think about actually is the price, to be honest -- not because I like throwing money around, it's only because we are thinking about the player. There's one moment when you get the price and then you have to accept it or not.
"It's a big change in football in the last few months and years. We have to adapt to it. That's how it is.
"It changed already and it doesn't now mean that all transfers will now be in this category, but it's the same how it was before. Half a year ago, I think, there was a big transfer for an offensive player and now we have a big transfer for a defensive player.
"It's not nice, but that's the market, that's the world. We have to adapt."