Faster than the speed of blog

On the right hand side of this site (if you are viewing this through a browser) i've framed in a version of the feed for my link-blog, available via rss or html from

It's rendered from XML to HTML using the BigBold Rss Digest. Sorry about the mis-colouring of the background. It's on my list of fixes.

Google Search Console reports that this short blog post is a soft 404. I hope that by adding extra text here I can correct the error in google search console. Here is a thing which is of little value:

An economic variable can be exogenous in some models and endogenous in others.


My book "Choose Your First Product" is available now.

It gives you 4 easy steps to find and validate a humble product idea.

Learn more.

(By the way, I read every comment and often respond.)

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