Suppose you owned a portfolio consisting of US $$250,000$ worth of long$-$term US government bonds.

$($i$)$ Would your portfolio be riskless?

$($ii$)$ Suppose you hold a portfolio of $$250,000$ worth of $30-$day Treasury bills. Every $30$ days your bills mature, and you reinvest the principal in a new batch of bills. Assume you live on the investment income from your portfolio and that you want to maintain a constant standard of living. Is your portfolio truly riskless?

$($iii$)$ Can you think of any asset that would be completely riskless? Explain.