Do citizens demand more democracy and political freedom as their incomes grow? That is, is democ - racy a normal good? To investigate this issue. you will explore the dataset Income Democracydta which contains a panel data set from 195 countries forthe years 1960; l965, . . . , 2000. A detailed description is given in Income Democracy Descriptionpdfl The dataset contains an index of politi - cal freedomfdemocracy for each country in each year, together with data on the country's income and various demographic controls. ( The income and demographic controls are lagged five years relative to the democracy index to allow time for democracy to adjust to changes in these variables.) Research tasks: 'I . Is the data set a balanced panel? Explain