Answer: Economic factor
Explanation: Economic factor is the factor that is responsible for influencing the economy and related factors. The affect is caused on wages,rates of tax, rates of interest , policy etc. These characteristics act on the business and organization indirectly rather effect the value of investment directly..
The example mentioned in the question is about the economic factor that is affecting his car purchase decision. The economic factor has led to increase in interest rates due to which problem of budget for Paul has risen.