Adding a lecture on Doubts or variability?

lectures/_static/quant-econ.bib

@@ -3,6 +3,13 @@
 Note: Extended Information (like abstracts, doi, url's etc.) can be found in quant-econ-extendedinfo.bib file in _static/
 ###
 
+@book{Sargent_Stachurski_2025, 
+  place={Cambridge}, 
+  title={Dynamic Programming: Finite States}, 
+  publisher={Cambridge University Press}, 
+  author={Sargent, Thomas J and Stachurski, John}, 
+  year={2025}
+}
 
 @incollection{slutsky:1927,
  address = {Moscow},
@@ -1296,6 +1303,27 @@ @incollection{Bewley86
   address   = {Amsterdam},
   pages     = {27-102}
 }
+@article{jacobson1973optimal,
+  title={Optimal stochastic linear systems with exponential performance criteria and their relation to deterministic differential games},
+  author={Jacobson, David},
+  journal={IEEE Transactions on Automatic control},
+  volume={18},
+  number={2},
+  pages={124--131},
+  year={1973},
+  publisher={IEEE}
+}
+
+@article{hansen1995discounted,
+  title={Discounted linear exponential quadratic gaussian control},
+  author={Hansen, Lars Peter and Sargent, Thomas J},
+  journal={IEEE Transactions on Automatic control},
+  volume={40},
+  number={5},
+  pages={968--971},
+  year={1995},
+  publisher={IEEE}
+}
 
 @article{Tall2000,
   author  = {Tallarini, Thomas D},
@@ -1308,6 +1336,28 @@ @article{Tall2000
   month   = {June}
 }
 
+@article{Hansen_Jagannathan_1991,
+  author  = {Hansen, Lars Peter and Jagannathan, Ravi},
+  title   = {Implications of Security Market Data for Models of Dynamic Economies},
+  journal = {Journal of Political Economy},
+  year    = {1991},
+  volume  = {99},
+  number  = {2},
+  pages   = {225--262},
+  doi     = {10.1086/261750}
+}
+
+@article{Weil_1989,
+  author  = {Weil, Philippe},
+  title   = {The Equity Premium Puzzle and the Risk-Free Rate Puzzle},
+  journal = {Journal of Monetary Economics},
+  year    = {1989},
+  volume  = {24},
+  number  = {3},
+  pages   = {401--421},
+  doi     = {10.1016/0304-3932(89)90028-7}
+}
+
 @book{Lucas1987,
   title     = {Models of business cycles},
   author    = {Lucas, Robert E},

lectures/_toc.yml

@@ -123,6 +123,7 @@ parts:
   numbered: true
   chapters:
   - file: markov_asset
+  - file: doubts_or_variability
   - file: ge_arrow
   - file: harrison_kreps
   - file: morris_learn