The potential for reversal of the demographic transition follows directly from conventional theory in population ecology and from the empirical relation we show here between energy consumption and fertility. (journals.plos.org)
Conventional theory holds that people purchase insurance because they prefer the certainty of paying a small premium to the risk of getting sick and paying a large medical bill....... (fortheloveoffoodblog.com)
This would explain the observations but does not fit into conventional theory. (sciencedaily.com)