feat: adds identifying downturn notes

Makefile

@@ -1,6 +1,6 @@
 ### Build tools
 #
-LATEXMK := latexmk -pdflatex="luahblatex %O %S" -pdf -dvi- -ps- -quiet -logfilewarninglist
+LATEXMK := latexmk -pdflatex="lualatex %O %S" -pdf -dvi- -ps- -quiet -logfilewarninglist
 WS := wolframscript -f
 
 ### Directory variables
@@ -11,7 +11,7 @@ CALC_DIR := calc
 
 ### Here we go
 #
-OUT_PDF:= $(PDF_DIR)/notes.pdf
+OUT_PDF:= $(PDF_DIR)/notes.pdf $(PDF_DIR)/identifying_downturn.pdf
 
 .PHONY: all
 all: $(OUT_PDF)
@@ -20,7 +20,7 @@ all: $(OUT_PDF)
 #
 
 ## setup main pdf deps as variable that subdirs can add to
-MAIN_PDF_DEPS := bibliography.bib
+COMMON_PDF_DEPS := bibliography.bib
 
 ## Defining common directory recipes
 $(PDF_DIR):
@@ -36,10 +36,15 @@ $(CALC_DIR):
 FIGURES := 
 ## Making main.pdf and other pdfs
 #
-$(PDF_DIR)/notes.pdf: notes.tex $(MAIN_PDF_DEPS) | $(PDF_DIR) $(FIGURES)
+$(PDF_DIR)/notes.pdf: notes.tex $(COMMON_PDF_DEPS) | $(PDF_DIR) $(FIGURES)
 	$(LATEXMK) $(<F)
 	cp $(@F) $@
 
+$(PDF_DIR)/identifying_downturn.pdf: identifying_downturn.tex $(COMMON_PDF_DEPS) | $(PDF_DIR) $(FIGURES)
+	$(LATEXMK) $(<F)
+	cp $(@F) $@
+
+
 ### Convenience scripts for tidying tex
 .PHONY: declutter
 declutter: