Answer: The Maturity Risk Premium would be zero.
Step-by-step explanation:
The Pure Expectations Theory believes that forward rates are just a representation of what people expect Future rates to be.
For this reason therefore, it believed that the Maturity Premium is Zero amongst Long Term Treasury Securities and that the difference in interest rates attached to Treasury bonds of different maturities is simply a result of what people perceive future interest rates to look like but as for Maturity Premiums, it doesn't exist in long term Treasury Securities.