[15_samuelson]_modify_lists

[shlff]

Good morning @jstac , this PR puts the following outside the lists following Samuelson used a *second-order linear difference equation* to represent a model of national output based on three components: in section Samuelson's Model of lecture samuelson:

• The idea that consumption plus investment plus government purchases constitute *aggregate demand,* which automatically calls forth an equal amount of *aggregate supply*.

I made this change because the other 3 points in the list are 3 components of the national output model mentioned above, but this point/sentence does not. It sounds like a remark on these 3 model components, so I treat it as a separate sentence outside the list.

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[jstac]

Thanks @shlff , I appreciate this suggestion.

However, as a stand-alone sentence, it is not grammatically correct. Could you please delete the words "The idea that"?

[shlff]

Thank for your great comments, @jstac . As you suggested, I correct the sentence as:

• Consumption plus investment plus government purchases constitute *aggregate demand,* which automatically calls forth an equal amount of *aggregate supply*.

[jstac]

Thanks @shlff . Would you mind to check why the test is failing and see if you can fix it?

[shlff]

Dear @jstac , thanks for your kind instruction. Now the problem has been solved and the PR is ready for merging now.

The test was failing because the feature master branch of this PR was behind our current master branch.

(This occurs when we have many PRs to merge.)

This can be solved by rebasing the feature branch off of the latest version of master, please find here.

(The same solution applies to this one.)

[jstac]

Thanks @shlff , nice work.