Current global oil production [is] equivalent to the daily work of billions of invisible slaves

The last two centuries of extraordinary economic growth in high-income countries are largely due to the availability of cheap fossil fuels. It makes sense when you break it down: the energy contained in a single gallon of oil is equivalent to 47 days of hard human labour, making current global oil production equivalent to the daily work of billions of invisible slaves.

K. Raworth, Doughnut Economics (2017), 263

Introducing a monetary fine effectively wiped out any feelings of guilt

Ten children's say-nurseries all introduced a small fine for parents who were more than ten minutes late collecting their children at the end of the day. The parental response? Rather than arriving more promptly, twice as many parents started arriving late. Introducing a monetary fine effectively wiped out any feelings of guilt, and was interpreted as a market price for overtime care.

K. Raworth, Doughnut Economics (2017), 120