The state of being poor, which depends on how you define it. One approach is to use some absolute measure. For instance, the poverty rate refers to the number of households whose income is less than three times what is needed to provide an adequate diet. (Though what constitutes adequate may change over time. ) Another is to measure relative poverty. For instance, the number of people in poverty can be defined as all households with an income of less than, say, half the average household income. Or the (relative) poverty line may be defined as the level of income below which are, say, the poorest 10% of households. In each case, the dividing line between poverty and not-quite poverty is somewhat arbitrary. As countries get richer, the number of people in absolute poverty usually gets smaller. This is not necessarily true of the numbers in relative poverty. The way that relative poverty is defined means that it is always likely to identify a large number of impoverished households. However rich a country becomes, there will always be 10% of households poorer than the rest, even though they may live in mansions and eat caviar (albeit smaller mansions and less caviar than the other 90% of households).