From 14f18c100c2f8c3ec9c60c14330d926cd2d6f639 Mon Sep 17 00:00:00 2001
From: Eduardo Julian
Date: Mon, 4 Apr 2022 22:47:56 -0400
Subject: Properly handling variance for arrays to avoid invalid subtyping.

---
 documentation/bookmark/business/model.md | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 documentation/bookmark/business/model.md

(limited to 'documentation/bookmark/business/model.md')

diff --git a/documentation/bookmark/business/model.md b/documentation/bookmark/business/model.md
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index 000000000..7857523b8
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+# Reference
+
+0. [Reciprocity as a Business Model: What motivates people to pay for services they receive?](https://briefthoughts.substack.com/p/reciprocity-as-a-business-model?s=r)
+
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