Overall I enjoyed Mr. Rachman's book but note a few shortcomings.
Starting with the positives, this book provides a useful framework for considering the trends in the last three decades of world history. The author is descriptive in his presentation, generally reserving opinion to remain neutral and neatly summarising significant global events. His style is concise and fluid, making reading very light work, as readers of his writing in the Financial Times would expect. All in all, it feels like a well-composed masters thesis.
Unfortunately, Mr. Rachman is, as noted by a few reviewers, quite selective in his coverage. It would appear that events that don't support his model are omitted. For example, there is almost no mention of the Israel-Palestine problem which, although it does not directly affect global population masses, serves as focal point and obstacle for many. Also unmentioned is AIDS - a scourge with global reach and particularly acute implications in Africa, which additionally, as a continent, is mostly overlooked.
I also feel the book betrays an unintentional western bias, assuming a moral high ground present in a lot of our commentary. For example, it is quick to highlight failings of personal liberty in China and authoritarian countries while giving sparse consideration of the consistent weaknesses of our foreign policies in this regard.
As a minor point, the neat and well-structured first two sections are let down by a less tidy, possibly rushed, third section. It might be a better experience for the reader to leave it out altogether. I'd have given four stars if it ended as strong as it started.