Imagine a seesaw with bond prices on one side and yields (interest rates) on the other. When the economy is thriving and interest rates increase, it's akin to someone sitting on the yield side, causing it to rise. Consequently, new bonds with higher interest rates emerge, making older bonds with lower rates less appealing. This could lead to a decline in the prices of those older bonds. Conversely, during economic downturns and declining interest rates, the seesaw tips the other way, rendering older bonds with higher rates more valuable.