Item 7A. Quantitative and Qualitative Disclosures About Market Risk
ITEM 7A.
QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RIS
 
Market risk represents the potential economic loss arising from adverse changes in the fair value of financial instruments. Currently, our exposure to market risk relates primarily to our fixed–income and equity portfolios. These investment portfolios are exposed primarily to, but not limited to, interest rate risk, credit risk, equity price risk, and concentration risk. We also have exposure to market risk that includes our cash and cash equivalents, and notes receivable. The Company's senior management has established comprehensive risk management policies and procedures to manage these market risks.
 
Interest Rate Risk
 
The fair values of our fixed–income investments fluctuate in response to changes in market interest rates. Increases and decreases in prevailing interest rates generally translate into decreases and increases, respectively, in the fair values of those instruments. Additionally, the fair values of interest rate sensitive instruments may be affected by the creditworthiness of the issuer, prepayment options, the liquidity of the instrument and other general market conditions. At December 31, 2021, we have available for sale marketable debt securities in the amount of $172,100,000. The fixed income portfolio is comprised of investments with primarily short–term and intermediate–term maturities. The portfolio composition allows flexibility in reacting to fluctuations of interest rates. The fixed income portfolio allows our insurance company subsidiaries to achieve an adequate risk–adjusted return while maintaining sufficient liquidity to meet obligations.
 
Our cash and cash equivalents consist of highly liquid investments with a maturity of less than three months when purchased. As a result of the short–term nature of our cash instruments, a hypothetical 1% change in interest rates would have minimal impact on our future earnings and cash flows related to these instruments.
 
We do not currently use any derivative instruments to hedge our interest rate exposure. We have not used derivative instruments for trading purposes and the use of such instruments in the future would be subject to approvals by the Investment Committee of the Board.
 
Credit Risk
 
Credit risk is managed by diversifying the fixed income portfolio to avoid concentrations in any single industry group or issuer and by limiting investments in securities with lower credit ratings. Corporate debt securities and asset–backed securities comprise approximately 68% of the fair value of the fixed income portfolio. At December 31, 2021, the credit quality ratings for our fixed income portfolio consisted of the following investment and non-investment grades (as a percent of fair value): 35% AAA rated, 12% AA rated, 36% A rated, 16% BBB rated, and 1% BB rated.
 
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Equity Price and Concentration Risk
 
Our marketable equity securities are recorded at their fair market value based on quoted market prices. Thus, there is exposure to equity price risk, which is the potential change in fair value due to a change in quoted market prices. At December 31, 2021, the fair value of our marketable equity securities is approximately $140,066,000. Of the $140.1 million marketable equity securities portfolio, our investment in NHI comprises approximately $93.7 million, or 67%, of the total fair value. We manage our exposure to NHI by closely monitoring the financial condition, performance, and outlook of the company. Hypothetically, a 10% change in quoted market prices would result in a related increase or decrease in the fair value of our equity investments of approximately $14.0 million. At December 31, 2021, our marketable equity securities had unrealized gains of $84.4 million. Of the $84.4 million unrealized gains, $69.0 million is related to NHI.