[cass_koopman] Updates to lecture (#458)

* updates

* updates

* change label

* fix minor error

* updates

* Tom's May 29 edits of fiscal policy in growth model lecture

* minor updates

* updates

---------

Co-authored-by: Humphrey Yang <[email protected]>
Co-authored-by: thomassargent30 <[email protected]>

Author: 3 people

lectures/_static/quant-econ.bib

@@ -3,6 +3,16 @@
 Note: Extended Information (like abstracts, doi, url's etc.) can be found in quant-econ-extendedinfo.bib file in _static/
 ###
 
+@article{mendoza1998international,
+  title={The international ramifications of tax reforms: supply-side economics in a global economy},
+  author={Mendoza, Enrique G and Tesar, Linda L},
+  journal={American Economic Review},
+  pages={226--245},
+  year={1998},
+  publisher={JSTOR}
+}
+
+
 @book{intriligator2002mathematical,
   title={Mathematical optimization and economic theory},
   author={Intriligator, Michael D},