It's really interesting and I'd defintely recommend it.
Anyway, they have a whole chapter where they go through what they believe are the 12 main secrets and rules of transfer market -
1) A new manager wastes money on transfers; don’t let him. (This is especially relevant if it's a club with a high turn-over of managers).
2) Use the wisdom of crowds. (Have a diverse group of people working as a team to identify and evaluate players rather than leaving it all to one individual)
3) Stars of recent World Cups or European championships are overvalued; ignore them.
4) Certain nationalities are overvalued.
5) Older players are overvalued. (They're priced based of performances they put in at the peak of their careers & past glories rather than what they can do at the present)
6) Centre-forwards are overvalued; goalkeepers are undervalued.
7) Gentlemen prefer blondes; identify and abandon “sight-based prejudices”. (Apparently blonde players are sub-consciously disproportionately popular with scouts because they stand out from a distance)
8) The best time to buy a player is when he’s in his early 20s.
9) Sell any player when another club offers more than he is worth.
10) Replace your best players even before you sell them.
11) Buy players with personal problems, and then help them deal with their problems.
12) Help your players relocate.
How well does what your club has done during the trasnfer window match up with these rules? And do they make sense to you or does selling your best players as soon as someone bids a ridiculous amount of money for them and buying players like Joey Barton make no sense?