1. Engel's law is an observation in economics stating that as income rises, the proportion of income spent on food falls, even if actual expenditure on food rises. In other words, the income elasticity of demand of food is between 0 and 1. The law was named after the statistician Ernst Engel (1821–1896). What is Engel’s Law? Engel’s Law is named after the statistician Ernst Engel, who was the first to investigate the relationship between income and spending on food in 1857. The law states that as income rises, the proportion of income that is spent on food decreases. This proportion, also called the Engel’s Coefficient, means that consumers increase their spending on food by a smaller amount than the increase in income. For example, a household which sees their income double is unlikely to double their spending on food. What is its application? The law implies that poor households spend a greater pr...