[jampekka]

I find it more useful to use more "absolute" terms. If by left you mean some fashion of socialism, then indeed left is not liberalist. But in contemporary politics such left is almost non-existant. E.g. most European "socialist" or even "communist" parties are staunchly liberal, and mostly celebrate consumerism.

I don't think "leftism" is really an ideology, or at least it can mean very different things in different contexts.

Edit: I find it also better to use "liberalist" instead of "liberal" when referring to the political movement and ideology. "Liberal" is easy to misinterpret and misuse, and it tends to hide the fact that liberalism a quite specific ideology, that e.g. has no monopoly on liberty.