A related CTJ study suggested tax was a factor.

And the Greens have suggested tax-payer funded election campaigns as a way of reducing the influence of money in politics.

Jean Limongy, a lawmaker in the Chamber of Deputies, Haiti's lower house of parliament, suggested tax breaks could help compensate businesses.

He suggested tax concessions for the wealthy had to be pared back as well as government spending programs primarily benefiting the lower paid.

West Australian MP Andrew Hastie suggested tax deductions on mortgage repayments should be available to "everyday Australians" rather than only investors.