This rule generally applies to cash or ring games of poker rather than tournament games and is intended to level the stakes by creating a maximum and minimum buy-in as well as rules for adding and removing chips from play when playing with cash.
A player also may not take a portion of their money off the table, unless they leave the game and take their entire stack out of play.
Table stakes is the rule in most cash poker games because it allows players with vastly different bankrolls a reasonable amount of protection when playing with one another.
They can be price, cost model, technology, or other capability that represents a minimum requirement to have a credible competitive starting position in a market or other business arrangement.
[2] Beyond that, real competitive advantage comes from additional nimbleness and cost or product differentiation.