deletions | additions       diff --git a/Market_with_no_international_trade__.md b/Market_with_no_international_trade__.md  index 937f4fe..4e586c4 100644  --- a/Market_with_no_international_trade__.md  +++ b/Market_with_no_international_trade__.md 
...
gains from economic activity = consumer surplus + producer surplus = surplus  https://en.wikipedia.org/wiki/Autarky  # Small open economy   assumes people can   1. sell any amount at world price  2. buy any amount at world price  Within lecture we're looking at diagram showing gain from exporting, using iron ore as example.