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The error message indicates that the function "getMarketRate" is not defined in the current component. To resolve this issue, you need to define the "getMarketRate" function in the component's methods section.

Here's an example of how you can define the "getMarketRate" function:

methods: {
  getMarketRate(totalMoney, totalPerformance) {
    // Implementation of the getMarketRate function
    // ...
    // Return the calculated value
    return marketRate;
  },
  // Rest of the methods...
}

Make sure to replace the comment "// Implementation of the getMarketRate function" with your actual implementation logic for calculating the market rate based on the "totalMoney" and "totalPerformance" parameters.