Answer:
Increase, decrease.
Step-by-step explanation:
CPI is consumer price index, which is use to measure cost of living of people which people have to spend to maintain good standard of living. However, parameter and component used as measurement tool are often considered as bias, which does not give right measurement. As a consequences of biasness the goverment outlay increases more than what is required and as taxes are also linked to CPI, therefore income are adjusted to check tax rate, which decrease the tax revenue for the goverment. It also reduce the government outlay than required to keep pace with cost of living.