How do economists measure levels of equality and inequality?
Wolff: The most common measure used, and the most understandable is: what share of total wealth is owned by the richest households, typically the top 1 percent. In the United States, in the last survey year, 1998, the richest 1 percent of households owned 38 percent of all wealth. This is the most easily understood measure. There is also another measure called the Gini coefficient. It measures the concentration of wealth at different percentile levels, and does an overall computation. It is an index that goes from zero to one, one being the most unequal. Wealth inequality in the United States has a Gini coefficient of .82, which is pretty close to the maximum level of inequality you can have. MM: What have been the trends of wealth inequality over the last 25 years? Wolff: We have had a fairly sharp increase in wealth inequality dating back to 1975 or 1976. Prior to that, there was a protracted period when wealth inequality fell in this country, going back almost to 1929. So you have t
