In: Finance
Explain why the linear model can provide only
approximate estimates of VaR for a portfolio
containing options
Answer) The change in the value of option not linearly relates to change in value of underlying variables . Thus when the change in value of underlying variable is normal , the change in value of option is not normal .
But the linear model asumes that it is normal or we can say that the linear model assumes that the change in the value of a portfolio is linearly related to percentage changes in the underlying variables.
It is therefore only an approximation for a portfolio containing options .