From 17a616f57607eb94b233d44781bedea0a36b9306 Mon Sep 17 00:00:00 2001
From: EilidhRoss1 <98904290+EilidhRoss1@users.noreply.github.com>
Date: Tue, 21 Jun 2022 12:41:01 +0100
Subject: [PATCH] add public goods

---
 concepts/public-goods.md | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/concepts/public-goods.md b/concepts/public-goods.md
index e42acf6..7befe44 100644
--- a/concepts/public-goods.md
+++ b/concepts/public-goods.md
@@ -1 +1,21 @@
-# Public goods
+# Public Goods
+
+Public goods are goods which anyone can use and benefit from, not just those who contribute to the creation and/or upkeep of the good.
+
+* Public goods are non-excludable: anyone can use them.  
+* Public goods are non-rival: one person's consumption of the good does not diminish another person's consumption of it.
+
+| Rival         | Non-Excludable |      Excludable       |
+| -----------   | ------------   | ----------------------|
+| Yes           | Private goods  | Common-Pool Resources |
+| No            | Club goods     | Public Goods          |
+
+## Examples of public goods:
+
+* National defence
+* Open source software 
+* City parks
+* Lighthouses
+* Street lights
+
+See [Public Goods Problem](public-goods-problem.md)