Future Lepton Hadron Colliders

Main parameters of future lepton-hadron colliders are estimated. Namely, THERA and Linac*LHC based ep, gamma-p, eA and FEL gamma-A colliders are considered. The physics search potential of these machines are considered.Comment: Presented at XXIII Physics in Collision Conference (PIC2003), Zeuthen, Germany, June 2003, 3 pages, LateX. FRAP0

Lumpy Consumer Durables, Market Power, and Endogenous Business Cycles

This paper examines the role of lumpy consumer durables and market power in generating endogenous cycles which seem to be consistent with the facts. When goods are durable, past consumption choices determine the current market size which consists of consumers who have not purchased the good previously, and who have the income to make their potential demand effective. Larger past sales, ceteris paribus, thus naturally result in a smaller current market size and income. In this manner, the seeds of a downturn are sown in an upturn.

Auctions with Positive Synergies: Experimental Evidence

In a standard auction, bidders bid more aggressively when the number of bidders increases. However, Krishna and Rosenthal (1996, Games and Economic Behavior) show that when bidders have multiple-unit demand that generates positive synergies, bidders bid less aggressively as the number of bidders increases. The first objective of this paper is to offer experimental evidence on this seemingly counter-intuitive theoretical prediction. Following the model of Krishna and Rosenthal, we design a simultaneous second-price sealed-bid auction for two objects with two types of bidders: single-object and multiple-object demand bidders. Our results show that bidders bid less aggressively with increased competition. The second objective is to investigate the effect of offering global bidders the option of bidding for both objects as a package as well as submitting individual bids for each object. Controlling for bidders' valuations, we find that offering this option to global bidders increases allocative efficiency and sellers' revenue.Auction, Positive Synergies, Increased Competition, Package Bids

Wage Equality in a General Equilibrium Model with Indivisibilities.

This paper looks at some consequences of a comittment to wage equality in some sectors of the economy which produce lumpy consumer goods. We show that in this setting, there are two equilibria, with high or low wages, incomes and output. In this closed economy, growth may be immiserizing. We also show that redistribution may eliminate the low wage equilibrium in productive economies but in unproductive ones it eliminates the market for indivisible good itself! This suggests why redistribution could be a "rich man's game".

Lumpy Consumer Durables, Market Power, and Endogenous Business Cycles

This paper examines the role of lumpy consumer durables and market power in generating endogenous cycles which seem to be consistent with the facts. When goods are durable, past consumption choices determine the current market size which consists of consumers who have not purchased the good previously, and who have the income to make their potential demand effective. Larger past sales, ceteris paribus, thus naturally result in a smaller current market size and income. In this manner, the seeds of a downturn are sown in an upturn.

When Does Trade Hurt? Market, Transition and Developing Economies

This paper argues that labor market distortions in transition and developing economies help explain differential impacts of trade liberalization. We assume that workers differ in ability. In a market economy their earnings depend on their ability. However, earnings are independent of ability due to a common wage set in manufacturing in a transition economy and because of family farms in a developing economy. Our work suggests that trade liberalization without structural reform can have serious adverse effects in transition and developing economies: there can even be mutual losses from trade.

Random Access Channel Coding in the Finite Blocklength Regime

Consider a random access communication scenario over a channel whose operation is defined for any number of possible transmitters. Inspired by the model recently introduced by Polyanskiy for the Multiple Access Channel (MAC) with a fixed, known number of transmitters, we assume that the channel is invariant to permutations on its inputs, and that all active transmitters employ identical encoders. Unlike Polyanskiy, we consider a scenario where neither the transmitters nor the receiver know which transmitters are active. We refer to this agnostic communication setup as the Random Access Channel, or RAC. Scheduled feedback of a finite number of bits is used to synchronize the transmitters. The decoder is tasked with determining from the channel output the number of active transmitters ($k$) and their messages but not which transmitter sent which message. The decoding procedure occurs at a time $n_t$ depending on the decoder's estimate $t$ of the number of active transmitters, $k$, thereby achieving a rate that varies with the number of active transmitters. Single-bit feedback at each time $n_i, i \leq t$, enables all transmitters to determine the end of one coding epoch and the start of the next. The central result of this work demonstrates the achievability on a RAC of performance that is first-order optimal for the MAC in operation during each coding epoch. While prior multiple access schemes for a fixed number of transmitters require $2^k - 1$ simultaneous threshold rules, the proposed scheme uses a single threshold rule and achieves the same dispersion.Comment: Presented at ISIT18', submitted to IEEE Transactions on Information Theor

A Comparison of Real Estate Marketing Systems: Theory and Evidence

The objective of this paper is twofold. One is to provide a search-theoretical model of the marketing choice of the seller. The model explains the seemingly contradictory empirical results as to whether a seller raises the price of his house to pass on a portion of the broker's commission to the buyer. The second is to offer empirical evidence on the impact of the MLS on the price. We control for selectivity bias in the data and obtain a surprising result that the decision to use a multiple listing service decreases the sale price of a property.