While it was published a few years ago, Robert Shiller's article in the Journal of Economic Education is worth reading. Among his suggestions is to draw on the history of economics:
"Teachers can ...best serve their students if they refer regularly and respectfully to the history of economic thought, conveying the reasons for the theoretical constructs of other times and the tentativeness of current theories."
"Teachers can ...best serve their students if they refer regularly and respectfully to the history of economic thought, conveying the reasons for the theoretical constructs of other times and the tentativeness of current theories."