HISTORICAL COST CONVENTION is that assets are recorded at their initial cost and are not subsequently revalued upwards, and liabilities valued at the amount initially received in exchange for the obligation. The relevance of the convention is that figures remain objectively based on verifiable figures, but in times of high inflation historical cost can become a dubious convention to follow.
DOUBLE DECLINING BALANCE DEPRECIATION see DECLINING BALANCE DEPRECIATION METHOD.
PREPAYMENT RISK, in the area of mortgage-backed securities, which are backed by loans on property, is the possibility that home owners will payoff their mortgages early, returning the investor's principal earlier than expected. This typically occurs during a declining interest rate environment, when home owners can refinance at lower rates, leaving investors vulnerable to the risk of reinvestment at lower rates.
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