[milderworkacc]

Of course you are allowed to change your output - but independently and in reaction to your own circumstances.

Collectively agreeing to simultaneously stop selling in order to force a change in the cost of your inputs is in most cases not legal.

The easy test is to ask yourself if it makes sense for an individual seller to reduce their output in the absence of any other changes. In this case, the answer is no. Only when they all collide to do it at the same time does it work.