When I see the false pride of people competing over high-heels I understand the basis of economics.
Once someone starts a trend in wearing a particular high-heel, they become expensive to the limit of economic equilibrium.
だからこそ私にはファシオンの業界が分かりづらいのです！
痩せ我慢 ＝ false pride; fake stoicism
経済の基本 = the basis of economics; the fundamentals of economics
誰かが抜け駆けしてヒールを履くからみんな辛い
均衡点ギリギリまでヒールは高くなる =>
Once someone starts a trend in wearing a particular high-heel, they become expensive to the limit of economic equilibrium.
start a trend = トレンドを始める
均衡点 = (point of) economic equilibrium
アメリカ合衆国 
