Well they don t purport to be the same sale Mackay claims that basket was exchanged at one point The other price is the price listed in a catalog Several explanations are possible Mackay s anecdote was simply incorrect the price in the catalog was wishfully higher Mackay s lower price occurred earlier in the mania when prices were somewhat lower Mackay s price occurred for an even smaller bulb I m sure there are other explanations As for an average Viceroy price there was a Dutch economist named N W Posthumus who compiled extensive price data in the 1920s It s possible his work would have this information but I don t have access to it and can t read Dutch Citation below if you re interested Die speculatie in tulpen in de jaren 1636 en 1637 Parts 1 3 Economisch historisch jaarboek 12 1926 3 19 13 1927 1 85 18 1934 229 40