Consider the following statements1. At the time of rising prices, NNP at current prices is less than NNP at constant prices.2. At the time of rising prices, NNP at current prices is higher than NNP at constant prices. 3. NNP at current prices and NNP at constant prices are always same irrespective of changes in prices.4. NNP at current prices is equal to NNP at constant prices at the time of stable prices. Which of these statements are correct?

National income accounting is a government bookkeeping system that measures a country's economic activity - offering insight into how an economy is performing. Such a system will include total revenues by domestic corporations, wages paid, and sales and income tax data for companies.