Air pollution: Madrid bans old cars to reduce emissions

Thanks to the BBC
https://www.bbc.co.uk/news/world-europe-46403397
and tutor2u (inc video)
https://www.tutor2u.net/economics/blog/madrid-bans-polluting-cars-from-the-city-centre

Should we ban festive "coffee" drinks?

Possibly if you read this
https://www.birminghammail.co.uk/whats-on/food-drink-news/revealed-shocking-amount-sugar-coffee-15417010

MRP theory

Thanks to econfix
http://blog.elearneconomics.com/a2-economics-marginal-revenue-product-theory/

Perfect competition

Thanks to econfix
http://blog.elearneconomics.com/a2-revision-the-perfectly-competitive-firm-and-the-market/

A customs union explained

Thanks to the BBC
https://www.bbc.co.uk/news/av/uk-46195799/reality-check-the-customs-union-explained

China's high speed railway network

Fascinating!
https://www.youtube.com/watch?time_continue=694&v=0JDoll8OEFE

Capital intensive warehouse

Ocado
https://twitter.com/TheEconomist/status/1061352039303798785