[OS X TeX] how best to draw diagrams

[Daniel Becker]

Hello,

for a paper in economics (trade theory) I have to draw several diagrams. 
Up to now, I am looking what the Lamport-book says and draw the pictures 
using the commands for arrows, lines, curves etc. And this is very time 
consuming, especially to get tangential points right.

It would be nice if anyone could have a look at the pictures and 
recommend a better / more efficient way to draw them. I would prefer 
LaTeX-Code for the pictures, not simply any graphics/drawing package and 
then including .pdf- or .jpg-files.

The pdf-output with all the pictures is here:
http://homepage.mac.com/dtbecker/.cv/dtbecker/Public/TP1.pdf-binhex.hqx

most of the pictures are included as .jgp-files, a snapshot from other 
papers.

The .tex-file is here:
http://homepage.mac.com/dtbecker/.cv/dtbecker/Public/TP1.tex-binhex.hqx

Thanks for any help and in general for this very helpful list!

daniel


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