[ak_aiyagari] New lecture on heterogeneous agent OLG model with transition dynamics (#595)

* [ak_aiyagari] Add source file

* Tom's Sept 2 edits of Zejin's fine new lecture

* [ak_aiyagari] Polish lecture

* Tom's edits of the ak_aiyagari lecture, September 4

* [ak_aiyagari] polish lecture

* updates

* minor updates

* updates

* minor updates

* update texttt

* fix latex error

* fix the latex error

* minor updates

* minor update

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Co-authored-by: Zejin Shi <shizejin94@gmail.com>
Co-authored-by: thomassargent30 <ts43@nyu.edu>

Author: 3 people

lectures/_toc.yml

@@ -105,6 +105,7 @@ parts:
   - file: markov_perf
   - file: uncertainty_traps
   - file: aiyagari
+  - file: ak_aiyagari
 - caption: Asset Pricing and Finance
   numbered: true
   chapters: