There are four different tax rates, namely:
a. proportional tax rate (equal), the tax rate by using a fixed percentage for each tax bases
b. degresif tax rate (down), the tax rate using the declining percentage for each tax bases
c. constant tax rates (fixed), ie tax rates that are fixed for each tax bases
d. progressive tax rates (ascending), the tax rate with a percentage of the ascending or increases to base each taxing

progressive tax rate is divided into three (3), namely:
1. proportional progressive, ie tax rates by fixed percentage increase.
2. degresif progressive, ie tax rates increase progressively decreasing with
3. progressive progressive, ie tax rates increase in the percentage of the ascending

The index number is a statistical measure to express the relative changes that occur from time to time one or more characteristics or other variables that are expressed as a percentage.
In economics known there are 3 kinds of index numbers as follows.

1. Price index number
Price index number is a measure that shows the price change from a period to another.

2. Quantity index numbers
Quantity index numbers are index numbers that indicate the changes that occurred in the number of commodities that are consumed from time to time.

3. Value index numbers
The value index number is the index numbers that indicate changes in the value of money from one period to another. The value can be obtained by the multiplication between price and quantity.

Economic growth
1. increase the amount of production of goods and services.
2. increase the amount of GNP from year to year and consider whether the increase is larger or smaller than the increase in the population.
3. GNP increased from year to year is not accompanied by changes in economic structure and development of science and technology.
4. GNP increase was not accompanied by an increase in social welfare and equity.

Economic development
1. increase quality production.
2. percentage increase in total GNP is greater than the percentage increase in population.
3. GNP increased from year to year, accompanied by changes in economic structure from traditional to modern, and is characterized by the development of science and technology.
4. increase in GNP was accompanied by increased social welfare, income distribution, and population growth.