When developing countries strive to construct efficient tax systems, they face enormous hurdles. To begin, the majority of workers in these countries are often employed in agriculture or tiny, informal businesses. Their incomes fluctuate since they are rarely paid a regular, fixed wage, and many are compensated in cash, "off the books." As a result, calculating the income tax base is difficult. Workers in these countries also do not generally spend their money in major stores that keep precise sales and inventory records. As a result, current revenue-raising methods, such as income and consumption taxes, play a limited role in these economies, and the likelihood of the government achieving high tax levels is almost ruled out.