an increasing trendp = 0.002
As for Y→N products, an immediate price decline of 78.92% ( β = −1.56, p < 0.001) was found after first bidding; the price level had no significant change after second bidding ( p > 0.05) and showed an increasing trend during the second procurement period ( β = 0.16, p = 0.002, 14.80% increment).