Assume perfect competition All producers and consumers have perfect knowledge
No transport costs
In reality, the existence of transport costs may eliminate a comparative advantage and prevent international trade
Only two economies producing two goods
Technological developments have resolved this problem enabling the comparison of multiple countries and goods and services
Costs do not change and the returns to scale are constant. (There are no economics of scale)
In reality, increased production will result from economies of scale where the production is more efficient if more goods and services are demanded. Ie - Bulk buying
The goods being traded are identical
In reality, goods can be different, for instance, comparing Panasonic TVs versus Phillip's TVs. Difficult to make comparison
Factors of production remain in the country However, it may be the factors of production, rather than the goods, that move from country to country. For example, developed countries, rather than exporting finished goods to LDCs, may invest capital in LDCs to enable goods to be produced there. Labour may migrate from low-wage to high-wage countries. (Apple products produced in China)
Assume perfectly free trade (No government intervention)
Government-imposed trade barriers
The capital account is a relatively small part of the balance of payments accounts and does not have a significant effect on the balance. The capital account has two components.
Capital transfers: a measure of the net monetary movements gained or lost through actions such as the transfers of goods and financial assets by migrants entering or leaving the country, debt forgiveness, transfers relating to the sale of fixed assets (tangible assets that firms own and use in production that have a useful life of at least one year) , gift taxes, inheritance taxes, and death duties.
Transactions in non-produced, non-financial assets: consisting of the net international sales and purchases of non-produced assets, such as land or the rights to natural resources, and the net international sales and purchases of intangible assets, such as patents, copyrights, brand names, or franchises.
Land
Rights to natural resources
Sales and purchases of intangible resources
Foreign exchange reserves may be used Financed by high levels of foreign investors buying of assets for ownership Financed by high levels of lending from abroad
The current account deficit increases the levels of foreign debt, and this may lower the credit rating
credit rating agencies including Fitch, Moody's and Standard and Poor (S&P)
Lower credit rating indicates greater risk and higher interest on loans; make it more difficult to borrow
Interest rates may be used to reduce the current account deficit and lose its functions as MP May reduce AD and employment due to the increase in net import