Essays on applied economics


Percentage of Cross Bidders in All Bidders



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Percentage of Cross Bidders in All Bidders





Percentage of cross bidder

Percentage of true cross bidder I

Percentage of true cross bidder II

Daily

0.23(700/3007)

0.21(627/3007)

0.22(648/3007)

Hourly

0.21(363/1700)

0.18(312/1700)

0.19(324/1700)

Minute

0.30(149/491)

0.25(121/491)

0.26(128/491)

True cross bidder I: bidders who bid across competing auctions and who are never the highest bidder of more than one auctions at any moment.

True cross bidder II: bidders who bid across competing auctions and who are never the highest bidder of more than one auctions at any moment in the last day.



Table 1.4
Statistics of Cross Bidders for the Last Day





Groups

Auctions per group

Last day cross bidder per group

Last day bidder per group

Proportion







Mean

Std

Min

Max

Mean

Std

Min

Max

Mean

Std

Max

Min

Mean

Std

Daily

419

2.28

0.87

2

9

0.63

1.02

0

6

3.61

2.44

12

1

0.17

0.28

Hourly

235

2.37

0.97

2

8

0.71

1.11

0

6

3.62

2.55

12

1

0.20

0.31

Minute

88

2.60

1.26

2

8

0.93

1.23

0

6

3.06

2.19

10

1

0.27

0.35

(For groups with positive bids in the last day only.)



Proportion: proportion of cross bidders.

T-statistics for the proportion of hourly sample and minute sample is:

T-statistics for the proportion of daily sample and minute sample is:

T-statistics for the proportion of hourly sample and daily sample is:
Table 1.5
Result on Bidding on the Auction with the Lowest Standing Bid

(for all bidders)





Groups

Bids on the auction with lowest standing bid

Total bids

Proportion







Mean

Std

Max

Min

Mean

Std

Max

Min

Mean


Std

Daily

458

8.95

7.68

37

0

13.29

12.51

79

1

0.79

0.20

Hourly

258

8.45

7.85

37

0

13.26

12.97

79

1

0.77

0.25

Minute

101

7.86

8.32

36

1

10.89

13.17

63

1

0.87

0.16

(Groups with positive bids only.)



Proportion: proportion of bids submitted on auction with the lowest standing bid.
T-test for proportion of minute and hourly sample:

T-test for proportion of minute and hourly sample:

T-test for proportion of hourly and daily sample:

Table 6



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