An investor purchases a company’s bond from two years ago with a lower coupon rate than this year’s bond. why would the investor want to buy a lower-interest bond in the secondary market?

This investor would want to buy a lower interest bond in the secondary market because of the opportunity to negotiate a lower par value to offset the lower interest rate.
If there is a lower value, there is a lower interest rate, which is what this investor is interested in.

The  ancient egyptians  who  built the pyramids  may have been  able  to move massive stone blocks across the desert by wetting the sand in front of a contraption  built  to pull the heavy objects