Day-to-day the formula could help in making decisions, such as whether to cook a meal or to get a takeaway, or whether to take public transport or a taxi, he said.

• 这个公式可以在日常生活中帮助人们做决定，例如，是叫自己做饭还是叫外卖，是乘公共汽车还是乘出租车。