Land <span>It refers to all natural resources which are free gifts of nature. Land, therefore, includes all gifts of nature available to mankind—both on the surface and under the surface, e.g., soil, rivers, waters, forests, mountains, mines, deserts, seas, climate, rains, air, sun, etc.
labor </span><span>Human efforts done mentally or physically with the aim of earning income is known as labour. Thus, labour is a physical or mental effort of human being in the process of production. The compensation given to labourers in return for their productive work is called wages (or compensation of employees).
capital</span><span>All man-made goods which are used for further production of wealth are included in capital. Thus, it is man-made material source of production. Alternatively, all man-made aids to production, which are not consumed/or their own sake, are termed as capital.
eutrenprenuer </span><span>An entrepreneur acts as a boss and decides how the business shall run. He decides in what proportion factors should be combined. What and where he will produce and by what method. He is loosely identified with the owner, speculator, innovator or inventor and organiser of the business. Thus, entrepreneur ship is a trait or quality owned by the entrepreneur.</span>
To make a PPP adjustment for comparing GDP we build a basket of comparable goods and services and look at the prices of that basket in different countries. Purchasing Power Parity is the exchange rate needed for say $100 to buy the same quantity of products in each country.
The atomic bomb
Hope this helped