Engel's Law
Even if your paycheck doubles, your stomach doesn't—explaining why food takes a smaller share of higher incomes.
Definition An economic principle stating that as household income rises, the proportion of total spending dedicated to food decreases. It was discovered in the 19th century by German statistician Ernst Engel through detailed analyses of working-class family budgets.
Our Stomachs Have Limits, but Other Desires Don't
Imagine earning $1,000 a month and spending $400 on food. That means 40% of your total budget goes solely to eating. Because we cannot survive without food, this baseline expense is almost impossible to cut, no matter how small your paycheck is.
Now, what if your hard work pays off and your monthly earnings jump to $5,000? Even if you buy premium groceries and dine out more often, spending $2,000 every month on food is quite difficult. No matter how wealthy you become, you cannot eat ten meals a day—our stomachs have a clear physical limit.
The extra money left over after buying food naturally flows into nicer clothes, travel, entertainment, or savings. While the basic desire to fill our bellies is quickly satisfied, our appetite for a higher quality of life is limitless.
As a result, as your income grows, the percentage spent on food naturally declines. This is the fundamental relationship between income and grocery bills we see in everyday life.
The Engel Coefficient Measures Financial Well-Being
The percentage of total household spending dedicated to food is called the 'Engel coefficient' or 'Engel index.' It serves as a classic benchmark for living standards, showing at a glance how prosperous a household or society is.
Food is an essential expense required to stay alive. A household that must spend over half its budget just to eat has little room left for culture, hobbies, or personal growth. It reflects a tight budget where simply getting by takes almost everything.
Conversely, a low Engel coefficient means that after covering basic nutrition, a family has plenty of discretionary income left over. It indicates the freedom to invest time and money into activities that elevate the quality of life.
For this reason, traditional economics used the Engel coefficient to gauge wealth gaps and societal development. Historically, an Engel coefficient below 25% indicated high prosperity, while one above 50% pointed to severe financial distress.
A Closer Look
To be precise, what declines when income rises is not the actual dollar amount spent on food, but its share of total spending. As earnings grow, people often buy higher-quality groceries and dine out more, so total food spending actually increases. However, food spending rises much more slowly than overall income, pulling its relative percentage down.
In modern societies with thriving dining, delivery, and gourmet cultures, interpreting the Engel coefficient has become trickier. Basic meals for survival and leisure dining for socializing get lumped together in food expenditures. A foodie household spending heavily on gourmet experiences is hardly struggling.
Furthermore, when overall inflation spikes or grocery prices surge, the Engel coefficient can jump temporarily regardless of changes in income. Because groceries are non-negotiable, rising food prices force the food share upward.
That is why modern economists do not rely on the Engel coefficient alone. They examine it alongside the Schwabe index (which tracks housing costs) as well as spending on education and healthcare to paint an accurate picture of household financial health.
🤔 Common misconceptions
A lower Engel coefficient means you are spending less actual money on food.
The total dollar amount spent on food usually goes up; it is the 'percentage' of total spending that decreases because income and other spending grow much faster.
🧺 Where you meet it
As income rises, the proportion of spending on essential food drops while the share dedicated to leisure and savings grows.