Figure A4.
Two graphs display the proportion of winning bids in relation to bid price ratios before 2016, examining the discontinuity at the 0.95 threshold from the perspectives of general and designated bidding.This figure presents two panels showing the relationship between bid price ratios and winning bid proportions for tenders held before 2016. Panel a, General competitive bidding, shows a mild decline near the cutoff, with an estimated discontinuity of negative 0.017 and z-value of negative 0.179. Panel b, Designated bidding, exhibits a larger drop around 0.95, with an estimated discontinuity of negative 0.696 and z-value of negative 5.848. Both panels display scattered data points representing sample averages within bins and a fourth-order polynomial fit line. The y-axis represents the proportion of winning bids, and the x-axis displays bid price ratios ranging from 0.85 to 1.0, with the vertical reference line marking the observed discontinuity.

Before FY2016: Verification of the discontinuity at 0.95

Note(s): Left panel: general competitive bidding. Right panel: designated bidding. The interpretation of the figure is the same as in Figure 4 

Source: Author’s own work

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