Or if a household does underreport its spending, he assumes that it also downplays its food expenses proportionately, so that their Engel’s coefficient is unaffected.
或者如果一个家庭少报了开支，他假设同一家庭同时也相应少报食物开支，这样恩格尔系数才不受影响。
2
In Mr Wang's survey, for example, the poorest people devoted 48% of their outlays to food, whereas the richest spent only 29% (an Engel's coefficient of 0.29).
Peng's Coefficient is inversely proportional to Engel's Coeffient, because the more proportion people spend on food, the less proportion on culture and spirit.