Within a given company, looking at how gross margins change over time gives you a sense of the trend toward greater or less efficiency in production activity. (fool.com)
Less energy means less efficiency while working on the farm, so you'll have to work less or consume more food to make up the deficit. (allgamers.com)
On the other hand, if there is life left in your pump and you can live with less efficiency for the time being, you might decide a repair is more cost effective. (qaeducation.co.uk)