BIG 4 usually refers to the largest accounting firms: Deloitte & Touche, Ernst and Young, KPMG, and PricewaterhouseCoopers.
DUTY is a tax imposed by a customs authority on imported goods. Often used interchangeably with the term "tariff."
INVISIBLE INCOME is foreign income from sources other than the movement of goods; can include earnings from tourism, banking, shipping, insurance and investment.
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