$21.(10$ points$)$ A one$-$year bond has an interest rate of $6\%$ and is expected to fall to $3\%$ next year and $1\%$ in two years. The term premium for a two$-$year bond is $0\mathrm{.}4\%$ and for a three$-$year bond is $0\mathrm{.}7\%.$

A$.$ What are the interest rates on a two$-$year bond and three$-$year bond according to the liquidity premium theory?

B$.$ Draw the corresponding yield curve, and discuss the economic implications.