Which of the following requirements is necessary to practice price discrimination? 
Definitions:
G20
An international forum for governments and central bank governors from 19 countries and the European Union, aimed at discussing policy pertaining to the promotion of international financial stability.
Head-of-government
The official who leads the executive branch of a government, typically responsible for implementing and enforcing laws and overseeing the day-to-day administration.
Emerging Market
An emerging market is a country with some characteristics of a developed market but does not meet standards to be fully termed as such. These markets are characterized by rapid growth and volatility, offering high risk and potential reward to investors.
Free Trade Policy
An approach by governments to increase economic prosperity by allowing goods and services to be traded across borders with minimal restrictions or tariffs.
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