Should a company ever produce an output if a manager knows it will lose money over the period?

I thought it would be ok to produce output because it sounds like economy of scale, where average cost declines over a broad range of output. But then I thought maybe its the learning curve, where the long run average cost of producing a given level of output declines as a company gains production experience. But then i was thinking maybe they shouldnt produce output if they lose money over the period if marginal revenue is less than marginal cost. I'm just not sure....