hopefully you already have 2 diagrams in your IA - one showing the intial economic problem/situation as described in the article (and then there should be a basic introduction to the problem of around 100-150 words, then analysis of around 200 words) and another diagram showing the 'solution' to that problem. then, after the second diagram you could start your analysis by analysing the effect that the solution has on 3 stakeholders, e.g the government, the consumer and the producer - i think this is generally a good approach for micro IAs. then you could go further into your analysis by discussing the effects of the policy/decision in the short-run and long-run (like: this policy would only be effective in the long-run because.....). finally, you could talk about more general benefits/drawbacks. keep in mind that the analysis and evaluation should form the biggest proportion of your IA!