If you can’t sell all you can produce, then reducing costs is often the only way to improve margins, but that simplistic accounting perspective is not always the case. Cost control is often thought to be key to attaining profitability but it the case of maintenance it can get you into trouble. Cost control can have a big opportunity cost if you don’t take advantage of the opportunities you have.
Figure 1 shows the basics – as production increases, revenues and costs both increase. Revenue is zero at zero production and increases to 100% at 100% output (if you can achieve it).