<p>Take a look at Ch 5 of Mastering Metrics (Angrist and Pischke) or their earlier &quot;Mostly harmless econometrics&quot;.</p>

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2020-08-14T18:52:59.413Z
This does not seem to answer the question, which is looking for the title of a paper.
Giskard
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2020-08-15T19:04:32.420Z
My reading is that the OP is asking for examples that need not appear in papers as opposed to books. The book of course contains references to papers.
LutzHendricks
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2020-08-20T10:40:44.130Z
@LutzHendricks Thanks. I know those books that tend to present the classic case (where only the treatment group is treated and not all the subjects). I'm really looking for papers here.
emeryville
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2020-08-20T20:01:29.790Z
The chapter in Mostly Harmless Econometrics cites a few papers:
Card, David, and Alan Krueger (1994): “Minimum Wages and Employment: A Case Study of the Fast Food Industry in New Jersey and Pennsylvania.” The American Economic Review 84, 772-84. 
—— (2000): “Minimum Wages and Employment: A Case Study of the Fast-Food Industry in New Jersey and Pennsylvania: Reply.” The American Economic Review 90, 1397-420.
There also the papers by Pischke, Autor 2003, Card 1992.
Perhaps I misunderstand what you are looking for, but these seem to fit the bill.
LutzHendricks
CC BY-SA 4.0
2020-08-22T07:21:58.600Z
@LutzHendricks I am aware of this paper. See this [thread](https://economics.stackexchange.com/questions/36006/in-difference-in-difference-approach-would-it-be-possible-to-add-a-dummy-variab/36009#36009). In Card-Krueger only New Jersey raised the state minimum, not eastern Pennsylvania. Please read my "treatment" and the difference between my treatment and control groups.
emeryville
CC BY-SA 4.0
2020-08-14T18:41:35.817Z
2020-08-14T18:41:35.817Z
LutzHendricks
<p>I remember reading a paper where the Difference-in-Differences was a bit special, but I had forgotten the details. My recollection was</p>
<ul>
<li>Two time periods, specifically one time period before treatment and one time period after treatment.</li>
<li>The &quot;treatment&quot; was such that <em><strong>all</strong></em> firms had to comply with a certain share of a variable X.</li>
<li>The <em><strong>treatment group</strong></em> consisted of firms with very low (or zero) share of X before the treatment, and</li>
<li>The <em><strong>control group</strong></em> consisted of firms with a share already close to the required share of X before the treatment.</li>
</ul>
<p>The idea was that the treatment group received most of the shock, while the control group was little affected.</p>
<p>Do you know a paper that uses such a framework?</p>

<econometrics><reference-request><applied-econometrics>
A Special Case of Difference-in-Differences
emeryville
# A Special Case of Difference-in-Differences

(Asked by: username_0 on 2020-08-14)

I remember reading a paper where the Difference-in-Differences was a bit special, but I had forgotten the details. My recollection was

* Two time periods, specifically one time period before treatment and one time period after treatment.
* The "treatment" was such that ***all*** firms had to comply with a certain share of a variable X.
* The ***treatment group*** consisted of firms with very low (or zero) share of X before the treatment, and
* The ***control group*** consisted of firms with a share already close to the required share of X before the treatment.

The idea was that the treatment group received most of the shock, while the control group was little affected.

Do you know a paper that uses such a framework?

**Tags:** econometrics, reference-request, applied-econometrics


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## 1 answers

### Answer by username_1 on 2020-08-14. Score: 1

Take a look at Ch 5 of Mastering Metrics (Angrist and Pischke) or their earlier "Mostly harmless econometrics".

> **Comments:**
> **username_2**: This does not seem to answer the question, which is looking for the title of a paper.  
> **username_1**: My reading is that the OP is asking for examples that need not appear in papers as opposed to books. The book of course contains references to papers.  
> **username_0**: @username_1 Thanks. I know those books that tend to present the classic case (where only the treatment group is treated and not all the subjects). I'm really looking for papers here.  
> **username_1**: The chapter in Mostly Harmless Econometrics cites a few papers: Card, David, and Alan Krueger (1994): “Minimum Wages and Employment: A Case Study of the Fast Food Industry in New Jersey and Pennsylvania.” The American Economic Review 84, 772-84.  —— (2000): “Minimum Wages and Employment: A Case Study of the Fast-Food Industry in New Jersey and Pennsylvania: Reply.” The American Economic Review 90, 1397-420. There also the papers by Pischke, Autor 2003, Card 1992. Perhaps I misunderstand what you are looking for, but these seem to fit the bill.  
> **username_0**: @username_1 I am aware of this paper. See this [thread](https://economics.stackexchange.com/questions/36006/in-difference-in-difference-approach-would-it-be-possible-to-add-a-dummy-variab/36009#36009). In Card-Krueger only New Jersey raised the state minimum, not eastern Pennsylvania. Please read my "treatment" and the difference between my treatment and control groups.  

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