Update blog post

QubitPi · Jul 30, 2024 · e26811f · e26811f
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@@ -39,5 +39,11 @@ Ch. 2 - Anchoring Effect
 Ch. 3 - 抽卡定律：首抽免费
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+Ch. 4 - Social Norms v.s. Market Norms
+--------------------------------------
 
+We live simultaneously in two different worlds
+
+1. one where social norms prevail, and 
+2. the other where market norms make the rules.