The winner of that particular rack collects the others' wagers. If a player's chips is less than wager, that player has to go "all in" which means all of that player's chips must be wagered. After every four , the wager rises.
The victor of that specific round takes in the others' bets. If a player's chips are insufficient to cover the wager, that player must "go all-in," which means they must risk all their remaining chips. Every four rounds, the wager increases.