This is the second in a series of seven papers on interest rates and it covers the relationship between the policy interest rate and the banks’ prime lending rate; the many, but related, interest rates on debt and deposits; the interbank market interest rates; and the relationship of money market interest rates. The seven papers cover: (1) what are interest rates?; (2) relationship of interest rates; (3) composition of interest rates; (4) interest rate discovery; (5) bank liquidity & interest rate discovery; (6) role of interest rates; (7) an optimal rate of interest: the natural rate.