The average PCR among the whole population would be 1 for food (well, slightly less than that given that some food gets thrown away) but much less than 1 for writing (so long as you don’t count stuff that no-one but the writer will read, such as shopping lists). Of course, the optimal PCR for a given individual may vary from that by several orders of magnitude, but in absence of any other information my prior is that it’s higher for food than for writing.
The average PCR among the whole population would be 1 for food (well, slightly less than that given that some food gets thrown away) but much less than 1 for writing (so long as you don’t count stuff that no-one but the writer will read, such as shopping lists). Of course, the optimal PCR for a given individual may vary from that by several orders of magnitude, but in absence of any other information my prior is that it’s higher for food than for writing.