John Quiggin emails me with a question.
bq. I need to look at the following question: do systems with high levels of campaign expenditure show weaker or stronger advantages for incumbency. My intuition, based almost entirely on the US is “stronger”, but I thought someone might have looked at this more systematically.
I’m unqualified to answer this question (not that this always stops me …) – what do people who are more familiar with this literature have to say?