When calculating purchasing power parity, what is being compared?

money needed to buy an item in different currencies
the number of imports and exports within one country
prices on the market for all goods and services available
total goods and services produced between two nations

the industrial revolution pushed the world into modern industrialization. it changed the course of history profoundly. it caused rapid urbanization and pushed cities and countries into development. the industrial revolution began in great britain with a series with new inventions which led to the creation of machines and mass production.

this caused the country to gain wealth and money and become an international superpower. it improved transportation and manufacturing inside the country, pushed people to live in urban areas and britain to become the most powerful nation in the world for a while.