What does the term “Triad” refer to? What does the term “Quad” mean?

A contract is an agreement by which two parties mutually promise to buy or sell some products. In practice, some informal contracts may be reached orally. This is understandable, but may lead to unfortunate consequences. A reasonable exporter should at least insist on strict observance of the legal requirements in case of orders that are not routine transactions. When the goods ordered represent a considerable value, a formal contract embodying all terms of the agreement should be prepared in duplicate；each copy should be signed by both parties,and each party should retain a copy of the contract.

There is a general misconception that market-seeking FDI in domestic sectors such as retail yields little development impact. The opposite is true. FDI in retail has been a key driver of productivity growth in Brazil, Poland, and Thailand, resulting in lower prices and higher consumption. Large-scale foreign retailers are also forcing wholesalers and food processors to improve. And they are now becoming important sources of exports； Tesco in Thailand and Wal-Mart in Brazil are increasingly turning to local products to feed their global supply chains. Retail also happens to be a pillar of the tourism industry.

技术、资本和现成的市场是跨国企业组织带给不发达国家的利益。

贸易可能产生于规模经济,即大规模生产的成本优势。

你不能为邻居的车投保，因为它如果损坏，你不会受到任何损失。

就出口商的利益而言，即期付款交单比远期付款交单有利。

比较利益学说在这个问题上提供了一个令人满意的答案。

ad valorem duties

centrally planned economies