Business economics

1)Describe using appropriate supply and demand diagrams, how the existence of data roaming charges affected both consumer and producer surplus in the mobile phone market.
2)Why do you think the European Union believed that data roaming charges was an example of market failure?
3)Could the European Union have used a tax or subsidy to correct the market failure in this particular case? Justify your argument.
4)Should mobile phone services providers have exercised social and ethical responsibility with regards to data roaming charges and not even have introduced them in the first place? Justify your argument.
4 вопроса, можно писать на русском языке. Каждый вопрос 230-250 слов, включить диаграммы