Merge branch 'main' into review_lectures

Author: HengchengZhang

lectures/_static/lecture_specific/long_run_growth/tooze_ch1_graph.png

@@ -617,6 +617,18 @@ plt.tight_layout()
 plt.show()
 ```
 
+
+It is instructive to compare the  preceding graphs with  graphs of log price levels and inflation rates for data from four big inflations described in
+{doc}`this lecture <inflation_history>`.
+
+In particular, in the above graphs, notice how a gradual fall in  inflation precedes the "sudden stop" when it has been anticipated long beforehand, but how
+inflation instead falls abruptly when the permanent drop in  money supply growth  is unanticipated.
+
+It seems to the author team at quantecon that the drops in inflation near the ends of the four hyperinflations described in {doc}`this lecture <inflation_history>`
+more closely resemble outcomes from the experiment 2 "unforeseen stabilization".  
+
+(It is fair to say that the preceding  informal pattern recognition exercise should  be supplemented with a more formal structural statistical analysis.)
+
 #### Experiment 3
 
 **Foreseen gradual stabilization**