Decision Making & Negotiations

This study reports on the ex-post performance of survivor REITs and RECs over a 14.5-year period covering several business cycles. The results show that the systematic risk and risk-adjusted returns of REITs and RECs are quite different, especially during periods of low growth in real GNP. Relative to the overall stock market, survivor REITs, in particular, equity REITs, exhibited less volatility and higher returns than previous studies revealed.

We consider a single-server queueing system with Poisson arrivals and general service times. While the server is up, it is subject to breakdowns according to a Poisson process. When the server breaks down, we need to repair the server immediately by initiating one of two available repair operations. The operating costs of the system include customer holding costs, repair costs and running costs. The objective is to find a corrective maintenance policy that minimizes the long-run average operating costs of the system. The problem is formulated as a semi-Markov decision process.

This article treats the dynamic lot size model with quantity discount in purchase price. We study the problem with two different cost structures: the all-units-discount cost structure and the incremental-discount cost structure. We solve the problem under both discount cost structures by dynamic programming algorithms of complexity O(T3) and O(T2), respectively, with T the number of periods in the planning horizon.

We consider distribution systems with a depot and many geographically dispersed retailers each of which faces external demands occurring at constant, deterministic but retailer specific rates. All stock enters the system through the depot from where it is distributed to the retailers by a fleet of capacitated vehicles combining deliveries into efficient routes. Inventories are kept at the retailers but not at the depot.

PASTA (Poisson Arrivals See Time Averages) is a term coined by R. Wolff in his well known 1982 paper. In keeping with Wolff's terminology, we use the term anti-PASTA to refer to the following converse of PASTA. Given that arrivals do indeed see time averages, when must the arrival process necessarily be Poisson? We show that anti-PASTA is satisfied in a pure-jump Markov process, provided that the arrival process corresponds to a subset of the Markov process jumps.

I construct an intertemporal model in which investors trade shares of a firm. All trading is done through competitive market makers. After the initial period and before the end of the planning horizon, information is asymmetrically distributed among traders, and the prices for investors who buy shares are higher than for those who sell shares. The presence of this deviation from the Walrasian paradigm notwithstanding, dividend policy does not affect the initial period's share price or shareholders' welfare. This result is robust to various extensions of the model.