OFFICIAL INTEREST RATE, normally, is the rate of interest charged by the government or traders within the money market, e.g., federal funds rate and bank repurchase agreement (repo rate).
DELTA, in securities trading, is the relationship between an option price and the underlying futures contract or stock price. In general usage, it is the difference between two empirical data points, e.g. the delta between 4 and 6 is 2.
FOOT A COLUMN is to add a column of numbers. To test footing is to add the column again to check accuracy.
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