The 1637 event gained popular attention in 1841 with the publication of the book "Extraordinary Popular Delusions and the Madness of Crowds", written by Scottish journalist Charles Mackay, who wrote that at one point of land were offered for a "Semper Augustus" bulb. Mackay claimed that many investors were ruined by the fall in prices, and Dutch commerce suffered a severe shock. Although Mackay's book is a classic, his account is contested. Many modern scholars feel that the mania was not as extraordinary as Mackay described and argue that not enough price data is available to prove that a tulip bulb bubble actually occurred.