If each feather becomes 50% lighter, how do you balance the scale?

1 kg of feathers weighs the same as 1 kg of iron. The scale is balanced.

Explanation

This isn't about weight — it's about value. Feathers got 50% lighter. You need twice as many to rebalance the scale. The iron didn't get heavier — each feather just got lighter. Your dollars work the same way. Do things just "get more expensive"? No.* Your money gets lighter through inflation, so you need more of it today to buy what cost fewer "feathers" yesterday.

*Temporary supply-and-demand asymmetries aside.