Profitable links

I think it is only fair I should warn readers that the Amazon links I often put in my posts—as for instance when mentioning “Introducing Monte Carlo Methods with R—are potentially earning me money through the Amazon Associates program! This means that each time a reader enters the Amazon website through one of those links and makes a purchase in the US—not necessarily the one referenced by the link—, I do receive 4% to 6% of this purchase from Amazon as a referral. Which is a great deal. The overall amounts I receive from Amazon are quite modest, of the magnitude of one free book every other month, but I thought readers should be warned about this possibly hidden and therefore involuntary support!