On this day in 1537 in the flower market of Haarlem, tulips are unable to fetch or exceed their expected price for the first time during the speculative craze of the Tulipomania—results posted the following day, eroding confidence in contract calls and causing the exchange to collapse spectacularly. Though perhaps the Dutch enterprise as the leading economic and financial power of the time weathered the crisis with relatively few lasting scars—the account and effects taking hold in the popular imagination after journalist Charles Mackay’s above investigation in 1841 (perhaps dissuaded from writing about the more recent South Sea Bubble as hitting too close to home) and modern economists dismiss many anecdotes (patrimony and parcels of land for a single bulb) as illogical and inefficient, the new phenomena nonetheless establishes the discipline of socio-economics and how markets can deviate from intrinsic value.