Charts showing the inflation-adjusted price of iPhones declining: https://www.perfectrec.com/posts/iPhone15-price
Charts showing the inflation-adjusted price of iPhones declining: https://www.perfectrec.com/posts/iPhone15-price
(There were some sporadic uses before Game of Thrones, but we're talking like 100 years before Game of Thrones, and the meaning was a bit different.)
Say your input costs go up 20%, and due to increased competition in your market segment, you can only raise your sell price by 10%. $80 times 1.2 is $96, and $100 times 1.1 is $110, netting $14 which is a 12.72% profit margin.
The price went up, but the margin went down, so you are incorrect.
The profit margin would be 4%, $100-$96 leaves $4 of profit. 4/100=0.04, multiply that by 100 to get 4%.
To maintain your previous profit margin if the cost to produce goes up by N%, your selling price must also go up by at least N% at the minimum.
If sell price increase % is higher than cost increase %, your margin will expand. If the reverse is true, your margin will contract.