Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Randomized Revenue Monotone Mechanisms for Online Advertising   Online advertising is the main source of revenue for many Internet firms. A
central component of online advertising is the underlying mechanism that
selects and prices the winning ads for a given ad slot. In this paper we study
designing a mechanism for the Combinatorial Auction with Identical Items (CAII)
in which we are interested in selling $k$ identical items to a group of bidders
each demanding a certain number of items between $1$ and $k$. CAII generalizes
important online advertising scenarios such as image-text and video-pod
auctions [GK14]. In image-text auction we want to fill an advertising slot on a
publisher's web page with either $k$ text-ads or a single image-ad and in
video-pod auction we want to fill an advertising break of $k$ seconds with
video-ads of possibly different durations.
  Our goal is to design truthful mechanisms that satisfy Revenue Monotonicity
(RM). RM is a natural constraint which states that the revenue of a mechanism
should not decrease if the number of participants increases or if a participant
increases her bid.
  [GK14] showed that no deterministic RM mechanism can attain PoRM of less than
$\ln(k)$ for CAII, i.e., no deterministic mechanism can attain more than
$\frac{1}{\ln(k)}$ fraction of the maximum social welfare. [GK14] also design a
mechanism with PoRM of $O(\ln^2(k))$ for CAII.
  In this paper, we seek to overcome the impossibility result of [GK14] for
deterministic mechanisms by using the power of randomization. We show that by
using randomization, one can attain a constant PoRM. In particular, we design a
randomized RM mechanism with PoRM of $3$ for CAII.

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The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
2
The categories of this paper are: math