Well also there could be a huge problem for $1 increase
look at this our current nation tax rate rule is
The national tax rate is a figure used to determine your income. It can be changed by choosing differentEconomic Policies and can fluctuate between 5% and 50%. Even though your national tax rate may change, your citizen's average income will also change inversely proportional. No matter how high or low your national tax rate is, you can not manipulate it to earn more money.
But I claim if we increase it by $1 we can manipulate tax rate to earn money
let me give an easy example
Nation name: Nation:A Nation:B
Average income: 20 5
Tax rate(initially): 5% 20%
So initially income: $1 $1
after project
Average income: 21 6
Tax rate: 5% 20%
Final income: $1.05 1.2
So indeed it will led to tax manipulating