The Basel Committee's approach to implementing varying liquidity horizons involved categorizing market variables based on the length of time horizons. This approach was outlined in a consultative document issued by the committee in January 2014. The variables were divided into five categories, each corresponding to a different time horizon. Category 1 variables had a time horizon of 10 days, Category 2 variables had a time horizon of 20 days, Category 3 variables had a time horizon of 60 days, Category 4 variables had a time horizon of 120 days, and Category 5 variables had a time horizon of 250 days. This categorization allowed for a more nuanced understanding of liquidity horizons, taking into account the varying timeframes over which different market variables can change.

Choice B is incorrect. The severity of change was not the criterion used by the Basel Committee to categorize market variables. The severity of change refers to the magnitude of fluctuations in a variable, which is different from liquidity horizons that refer to the time it would take for a bank to exit or hedge all material risk positions without affecting market prices.

Choice C is incorrect. Size of market was not used as a criterion either. While size of market can influence liquidity, it's not directly related to liquidity horizons which are more concerned with timeframes rather than size.

Choice D is incorrect. Type of product was also not used as a criterion for categorizing market variables in terms of liquidity horizons by the Basel Committee. Although different types of products may have different levels and speeds at which they can be liquidated, this does not directly relate to how these variables were categorized according to their respective liquidity horizons.

Things to Remember

• Market Liquidity: Market liquidity refers to the ease with which an asset can be bought or sold in the market without causing a significant change in its price. It is an important consideration for financial institutions when managing their risk exposures.
• Liquidity Horizons: Liquidity horizons refer to the time it would take for a bank to exit or hedge all material risk positions without affecting market prices. Understanding liquidity horizons is crucial for effective risk management.
• Basel Committee on Banking Supervision: The Basel Committee on Banking Supervision is an international regulatory body that provides guidelines and recommendations on banking regulations, including liquidity risk management.