diff --git a/concepts/zero-sum-game.md b/concepts/zero-sum-game.md
index af60066..63f9780 100644
--- a/concepts/zero-sum-game.md
+++ b/concepts/zero-sum-game.md
@@ -1,5 +1,5 @@
 # Zero Sum Game
-An economic game in which involves two sides and where the result is an advantage for one side and a loss for the other. The sum of all gains and losses across all players sums to zero.
+An economic game which involves two sides and where the result is an advantage for one side and a loss for the other. The sum of all gains and losses across all players sums to zero.
 
 Investing in crypto tokens is necessarily a zero sum games before considering the cost of transactions and network maintenance. 
 
@@ -12,4 +12,4 @@ An economic game where all gains and losses across all players sums to a negativ
 1. Stivers, A. 2019. ‘The Alchemy of a Pyramid: Transmutating Business Opportunity Into a Negative Sum Wealth Transfer’. http://ssrn.com/paper=3497682.
 1. Stolfi, Jorge. n.d. ‘Bitcoin Is a Ponzi’. Accessed 19 March 2022. https://ic.unicamp.br/~stolfi/bitcoin/2020-12-31-bitcoin-ponzi.html.
 1. ‘Why Bitcoin Is Worse than a Madoff-Style Ponzi Scheme’. n.d. Accessed 20 March 2022. https://www.ft.com/content/83a14261-598d-4601-87fc-5dde528b33d0.
-1. Shri T Rabi Sankar. n.d. ‘Cryptocurrencies – An Assessment’. Reserve Bank of India. Accessed 2 March 2022. https://rbi.org.in/Scripts/BS_SpeechesView.aspx?Id=1196.
\ No newline at end of file
+1. Shri T Rabi Sankar. n.d. ‘Cryptocurrencies – An Assessment’. Reserve Bank of India. Accessed 2 March 2022. https://rbi.org.in/Scripts/BS_SpeechesView.aspx?Id=1196.