♡ 36 ( +1 | -1 ) taoistlunaticWhite accepts the isolated pawn because he can avoid it only by inferior lines of play. His principal compensation is fairly obvious: Black has still not freed his position. In order to do that Black will have to play e5 in due course, dissolving White's isolated pawn. Meanwhile, White enjoys free play with his pieces.
♡ 15 ( +1 | -1 ) thanks philaretus.I basicaly thought so, but why are the other lines of play inferior? I guess they allow black to free his position, nevermind, answered my own question... :)
♡ 27 ( +1 | -1 ) The IQPis a static weakness, but it is also a dynamic strength. Simply having an IQP is not necessarily a weakness, and in many cases it leads to a kingside attack supported by an outpost on e5 or similar themes. At any rate, in modern practice it is perfectly acceptable to assume an IQP, depending upon the position.
Of course this one example shouldn't drive you to the other extreme and convince you that "all IQP positions are good for white" - but rather show you the dinamic chances white gets in return for the static weakness.