When I manage to get to the farm shop I can buy as many eggs as I need even though they are priced by the half-dozen. Meats and fruits are by weight.
Going to the supermarket is so much different. The best free range eggs come in sixes or 10s. Top of the range breakfast sausages are in eights and the best dry cure bacon is in packs of 12 slices. Beans are a mystery; according to some tins the 'per portion' size is slightly over three on others it is just under four.
It does my head in.