1) Group employing lobbyists 2) Personal stake 3) Special concern of a tailor 4) Stake 
[communication theory] Vested interest is a communication theory that seeks to explain how influences affect behavior. As defined by William Crano, vested interest refers to the amount that an attitude object is deemed hedonically relevant by the attitude holder (Crano, 1995). In Crano`s theory of vested interest, he states that `an attitud...
Right to immediate or future entitlement
[n] - an interest in which there is a fixed right to present or future enjoyment
noun groups that seek to control a social system or activity from which they derive private benefit