Hi Muhammad. I'm actually working on the A2 content this year. I won't be able to finish all the chapters before the 31st October. It took me about a year to put up all the AS videos (about 100 in total) and will take me quite a bit of time to work through A2 economics as well. As for the five units, I'm starting with unit 1 which should be finished within the next 4 weeks. Then there is the massive unit 2 which should take me a few months. I believe I can get at least 50% done by the summer exams. I know that doesn't help you much but if you want some support on essays and other questions, why not just email me and let me know exactly how I can help. EnhanceTuition@gmail.com. All the best and please keep posting comments, it helps me know how I'm doing.

EnhanceTuition you're doing great, most precise and easy to understand videos youtube i'd say, keep up your good work sir, huge help. I will get in touch with you via email. Thanks alot sir.

+muhammad farrukh Khan the kind words motivate me to keep at it. I will do my best to help!

In the case of demerit goods, the marginal benefit we get from consuming the good is way more than the marginal cost to producers for producing it and allocative efficiency is achieved when MB= MC so market failure occurs.