One suggestion in the comments to the ongoing “short & simple” series is to cover the balance of payments. This will be covered at some point in the introductory series, but I am still considering how best to present it in brief, simple form. With that in mind, it seemed worth attempting a regular post on the topic. The post is still intended to be elementary in nature, but is perhaps at about the introductory university level. The post is also too long to qualify as “short”, even allowing for the fact that some recent parts of the series have already stretched the definition of “short” beyond what I would have preferred.