Paraphrasing Warren Buffet, “Risks arise by not knowing what you are doing”, the recent
events and the popular prosecution led governments, authorities and regulator to ask the
following questions: Do the financial institutions understand the risks they are taking? Is
this one properly measured? Regulatory requirements (BCBS, 2013; and FSB, 2013) arose
demanding banks to assess their risk appetite in order to answer these questions. However,
the discussion around the terminologies and their implications are still ongoing, for example,
it is complicated to talk about appetite in operational risk.
In this paper, the risk appetite is defined as the level of risk a bank is ready to accept
(assuming the risk is measurable) to generate a particular rate of return. In this sense, it may
be regarded as the inverse function of the risk aversion in the traditional sense (Arrow,
1971). The risk management role is to build a framework allowing to reach the return expected
through the appetite. Therefore, the risk department of a financial institution cannot be
considered anymore as a support function as it mechanically becomes a business function.
Actually, a bank can be represented as a portfolio of multiple risks; therefore, it is clearly
possible to draw a parallel between risk appetite measurement and the more traditional portfolio theory such as the efficient frontier (Markowitz, 1952), the Capital Asset Pricing
Model (CAPM) (Sharpe, 1964) or the Arbitrage Pricing Theory (APT) (Ross, 1976).
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