Could someone please:help me with this assignment topic please?

what would be the best intro (thesis statement) for this topic (Brief outline what will be covered (thesis statement) and some context regarding the issue

Topic:

In many countries, including Australia, obesity is a problem, and some people in the health industry have argued that a tax on sugar-sweetened beverages (SSBs) is required.

Explain, with the use of an appropriate economic model, the type of externality that a tax on sugar-sweetened beverages (SSBs) would aim to address. Using economic terms and analysis, discuss the possible advantages and disadvantages of this type of tax, and whether or not it is likely to be effective at reducing health problems associated with obesity.

these points to help on what i need to include in my intro that i will later be discussing

1-Define market failure and explain externalities ( Discuss why negative externalities occur and why they are an example of market failure. Clearly distinguish between negative consumption externalities and negative production externalities. Explain that a sugar tax aims to address a negative consumption externality.)

2-Specific details and diagram related to this topic:

In more detail, explain the negative consumption externality that you are discussing in this topic. Explain the negative effects that a tax on SSBs is aiming to reduce. Provide some evidence/data.

Explain the effects of this negative externality, specifically referring to inefficiency and market failure.

Include and explain a diagram illustrating a negative consumption externality

Clearly label your diagram.

Define relevant terms.

Explain your graph by referring to specific points on the graph

3 Policy evaluation

Outline the types of policies that could be used to address a negative consumption externality.

Include a theoretical diagram/graph to demonstrate how this specific policy - the tax on SSBs - (in theory) addresses the market failure associated with a negative consumption externality.

Evaluate the effectiveness - advantages and disadvantages - of proposed a tax on SSBs with evidence to support assertions.

When evaluating the policy, consider issues such as the ease of implementation, cost of implementing the policy, effectiveness (will it work), equity concerns, other issues that impact the effectiveness of the policy. Are there other alternative policies that you think would be better? If so, include theory and evidence.

Evidence from similar policies in other countries can be used.

Brief overall evaluation.