Personal experience and surveys on running out of socks; discussion of socks as small example of human procrastination and irrationality, caused by lack of explicit deliberative thought where no natural triggers or habits exist.
To expand on the topic of experimenting & grocery shopping, I would summarize good grocery shopping as involving, (in descending order of marginal returns), advance planning to select efficient targets, selection of grocery stores by total cost (including travel time), selection of cheapest version (experimentation up front, then selecting by unit cost), avoiding grocery store trickery like coupons, and using assistance like a standard grocery store shopping list to maintain correctness of decisions.