At the last GDT auction held almost a fortnight ago, WMP prices recorded a decline of 1.7% in average selling price to just over $2,200/t. However, despite this decline, the price of WMP futures contracts has remained steady in the intervening period and actually increased by a modest 1.5% in the last week ahead of the next GDT auction this Wednesday.Accounting for the bulk of milk utilisation in New Zealand, WMP prices have a significant say on farmgate returns and are the principal driver behind the performance of the GDT index.