Doctor: It would benefit public health if junk food were taxed.
Evidence
Not only in this country but in many other countries as well, the excessive proportion of junk food in people's diets contributes to many common and serious health problems.
If junk food were much more expensive than healthful food, people would be encouraged to make dietary changes that would reduce these problems.
Conclusion
It would benefit public health if junk food were taxed.
Evaluate
The argument is designed to support the view that taxing junk food would benefit public health.