AVAL is a term meaning inseparable from the financial instrument. This gives a guarantee and is abstracted from the performance of the underlying trade contract: Article 31 of the 1930 Geneva Convention of the Bills Of Exchange states that the aval can be written on the bill itself or on an allonge. US Banks are prohibited from avalizing drafts.
CALLABLE BOND is a bond the issuer has the right to pay off at issuers discretion.
BIG 4 usually refers to the largest accounting firms: Deloitte & Touche, Ernst and Young, KPMG, and PricewaterhouseCoopers.
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