I recommend a bit of criticl reading of some world-systems theory, not perfect but it outstrips decandence theory any day of the week.
Shaky hands gesture

Although to be honest I'd recommend non-marxist economic history as well. Decadence theory is krazy.
i'm not trying to define the word/play a game of semantics to work out what Marxist decadence is. that's not the best way of working out what a philosophical idea is, tho i'm sure it depends on the philosopher (Thomas Szasz "the anti-psychiatrist" is accused of Websterian philosophy by critics).



Can comment on articles and discussions
I don't see this as the central contradiction of capitalism (if, indeed, there is a fundamental one). Surely the more pressing contradiction is the tendency of the rate of profit to fall?
I mean, surely overproduction can be continually resolved through some kind of continuous expansion? To use Harvey's terms - expanded reproduction and/or accumulation by dispossession. Whilst this in itself is able to resolve the problem of overproduction (or, what to do with the surplus value in order that it might be valorized), it can't negate the fact that capitalism, in order to create profit, engages in processes (esp. the concentration and increased reliance upon capital) that weaken the general rate of profit. This for me is much more damaging - and I can't really see how it has anything to do with decadence.