Explanation:

• India `s national income on nominal basis is 2.9 trillionUS $ which is 6 largest in the world.
• On the PPP basis, China is world's largest economy in 2018. Total wealth of china is estimated at 25.3 trillion international dollar.
• China is followed by United States with figure 19.4 trillion.
• India, which is 6th largest economy in nominal terms, is at third place.
• Tuvalu is the world's smallest national economy with a GDP (PPP) of approximately Int. $44 million.