Liberalization refers to the relaxation of government regulations, licensing requirements, and other controls on the private sector. This policy is intended to encourage competition, increase efficiency, and promote economic growth by allowing market forces to play a larger role in the economy.

Assertion (A) defines the Balance of Payments as a record of receipts and payments between residents and non-residents. Reason (R) provides the definition of the Balance of Payments as a systematic record of economic transactions between residents and the rest of the world. Since (R) essentially defines the scope described in (A), it serves as the correct explanation for the assertion.

Gifts from foreigners are typically classified as current transfers (unrequited receipts) rather than capital inflows. Capital inflows usually involve the movement of assets or liabilities, such as foreign direct investment or loans, rather than non-repayable transfers.

Adam Smith introduced the theory of Absolute Advantage in his 1776 work, 'The Wealth of Nations'. He argued that a country has an absolute advantage if it can produce a good more efficiently—using fewer resources—than its trading partners, thereby encouraging specialization and trade based on cost efficiency.

Governments often impose trade barriers, such as tariffs or quotas, primarily to protect domestic industries from foreign competition. This strategy, known as protectionism, aims to give local firms a competitive advantage, preserve domestic jobs, and allow infant industries to grow without being overwhelmed by established international competitors, even if it may lead to higher prices for consumers.

An importer must pay in foreign currency. If the home currency weakens (depreciates), the importer must pay more units of home currency to acquire the same amount of foreign currency, resulting in a loss. Conversely, if the home currency strengthens, the importer pays less, which is a benefit, not a loss. Thus, only statement (1) is correct.

Invisible transactions in the balance of payments refer to services rather than physical goods. These include transportation services, travel expenditures for various purposes, and financial services such as insurance premiums and claims. Since all listed options represent service-based economic activities that do not involve the physical movement of merchandise across borders, they are correctly classified as invisible items.

David Ricardo introduced the Law of Comparative Advantage in his 1817 work, 'On the Principles of Political Economy and Taxation.' He demonstrated that countries can benefit from trade even if one country is more efficient at producing everything, provided they specialize in goods where they have a lower opportunity cost compared to their trading partners.

Source answer preserved: option C (Both A and B). AI attempted to change protected answer data (option_d), so this item is flagged for manual review before study use.

The correct matches are: Theory of reciprocal demand (John Stuart Mill), Theory of absolute advantage (Adam Smith), Theory of comparative advantage (David Ricardo), and Product life cycle theory of trade (Raymond Vernon). These theories form the foundation of classical and modern international trade economics, explaining why nations trade and how they benefit from specialization.