mp_afterroundmoney <amount>
Amount of money awarded to every player after each round.
By default this is 0 because the regular round-end economy already pays players through other systems — win/loss bonuses, kill rewards, bomb plant and defuse, and hostage rescue. mp_afterroundmoney stacks a flat bonus on top of all of that. Individual rewards are gated by mp_playercashawards and team rewards by mp_teamcashawards.
Examples
mp_afterroundmoney 0 - No extra bonus; only the normal round-end payouts apply (default).
mp_afterroundmoney 2147483647 - Maximum amount of money the command accepts. Writing a bigger number (e.g. 99999999999) will not work — you have to write exactly 2147483647 for the maximum.