For which of the following reasons are tax systems in developing countries often regressive? Check all that apply. For which of the following reasons are tax systems in developing countries often regressive? Check all that apply. Developing countries tend to rely more on sales taxes than on income taxes Most poor people in the country work in the shadow economy and thus do not have their income directly taxed. The rich are taxed at higher rates than the poor Tax deductions are concentrated in areas such as home ownership and charitable donations that the poor generally do not engage in