The economics of garbage collection

This paper argues that economic theory can improve our understanding of memory management. We introduce the allocation curve, as an analogue of the demand curve from microeconomics. An allocation curve for a program characterises how the amount of garbage collection activity required during its execution varies in relation to the heap size associated with that program. The standard treatment of microeconomic demand curves (shifts and elasticity) can be applied directly and intuitively to our new allocation curves. As an application of this new theory, we show how allocation elasticity can be used to control the heap growth rate for variable sized heaps in Jikes RVM

Talking Trash: Valuing Household Preferences for Garbage and Recycling Services Bundles Using a Discrete Choice Experiment

Facing increasing costs for tipping fees and worker salaries, many smaller municipalities have begun to explore ways to adopt mechanized pay-as-you throw container garbage collection and changes to the basket of currently provided services, such as the addition of curbside recycling. Choice-experiments, while used widely in marketing, have not often been applied to environmental policy issues such as municipal waste. Using a discrete choice experiment offers a new way to examine the basket of services cities provide in waste collection given limited budgets and often vocal opposition to change among residents. A discrete choice model is developed to test household preferences for municipal waste services in Stillwater, Oklahoma. In addition, the study compares the willingness to pay estimates for adding curbside recycling service from the discrete choice model ($1.98/household/month) with results from an embedded contingent valuation question ($1.35/household/month). The survey shows that residents are willing give up one of two weekly garbage days to obtain weekly curbside recyclable collection. Furthermore, women are willing to willing to pay more than men for curbside collection of recyclables.Consumer/Household Economics,

Flash Memory Garbage Collection in Hard Real-Time Systems

Due to advances in capacity, speed, and economics, NAND-based flash memory technology is increasingly integrated into all types of computing systems, ranging from enterprise servers to embedded devices. However, due to its unpredictable up-date behavior and time consuming garbage collection mechanism, NAND-based flash memory is difficult to integrate into hard-real-time embedded systems. In this thesis, I propose a performance model for flash memory garbage collection that can be used in conjunction with a number of different garbage collection strategies. I describe how to model the cost of reactive (lazy) garbage collection and compare it to that of more proactive schemes. I develop formulas to assess the schedulability of hard real- time periodic task sets under simplified memory consumption models. Results show that I prove the proactive schemes achieve the larger maximum schedulable utilization than the traditional garbage collection mechanism for hard real-time systems in flash memory

A Geographical Study on Solid Waste Disposal Management in Pyawbwe

Waste generation is increasing in Pyawbwe year by year because of increasing population, developing technologies and expanding economy. Physical factors describing the study area, both now and projected for the future, size, growth patterns, population, influence the economics of the proposed solid waste management systems. Solid wastes are collected under bell ringing system and communal dump collection system and are disposed at final landfilled waste disposal site located at Ingyin Kone cemetery. By using the Pearson's Product Movement Correlation Method, it is found that the correlation between the generation of solid from households and the collection of Municipal Department of Pyawbwe, there is high degree of positive correlation. Solid waste generation is depending upon the number of Tank Carriers and garbage trucks and it is also significantly related with households in Pyawbwe. These results indicate that it is necessary for the management of household solid wastes in Pyawbwe to take prior

How a Fee Per-Unit Garbage Affects Aggregate Recycling in a Model with Heterogeneous Households

This paper develops a utility maximizing model of household choice among garbage disposal, recycling, and littering. The impact of a user fee for garbage collection is modelled for heterogeneous households with different preferences for recycling. The model explains (1) why some households participate in curbside recycling programs even in the absence of a user fee, (2) why other households do not participate, even in the presence of a user fee, and (3) why some households choose to litter when others do not. Household choices are aggregated to determine the effect of a user fee on the community-wide quantities of garbage, recycling, and litter. We show how an increase in the user fee can decrease aggregate recycling.

The Economics of Residential Solid Waste Management

This paper provides a broad overview of recent trends in solid waste and recycling, related public policy issues, and the economics literature devoted to these topics. Public attention to solid waste and recycling has increased dramatically over the past decade both in the United States and in Europe. In response, economists have developed models to help policy makers choose the efficient mix of policy levers to regulate solid waste and recycling activities. Economists have also employed different kinds of data to estimate the factors that contribute to the generation of residential solid waste and recycling and to estimate the effectiveness of many of the policy options employed.

Outsourcing Public Services: Ownership, Competition, Quality and Contracting

We survey the literature on the effects of public sector outsourcing. Guided by theory, we systematically arrange services according to the type and magnitude of their contractibility problems. Taken as a whole, the empirical literature indicates that public sector outsourcing generally reduces costs without hurting quality. This is clearly the case for “perfectly contractible services” like garbage collection, but outsourcing often seems to work reasonably well also for some services with more difficult contracting problems, e.g. fire protection and prisons. Outsourcing seems to be more problematic for credence goods, with residential youth care as the prime example. In contrast to previous reviews, we conclude that ownership and competition appear to be about equally important for the consequences of public sector outsourcing.Outsourcing; Contracts; Tendering; Ownership; Competition; Quality

"Household Responses for Pricing Garbage by the Bag,"

This paper estimates household reaction to the implementation of unit-pricing for the collection of residential garbage. We gather original data on weight and volume of weekly garbage and recycling of 75 households in Charlottesville, Virginia, both before and after the start of a program that requires an eighty-cent sticker on each bag of garbage. This data set is the first of its kind. We estimate household demands for the collection of garbage and recyclable material, the effect on density of household garbage, and the amount of illegal dumping by households. We also estimate the probability that a household chooses each method available to reduce its garbage. In response to the implementation of this unit-pricing program, we find that households (1) reduced the weight of their garbage by 14%, (2) reduced the volume of garbage by 37% and (3) increased the weight of their recyclable materials by 16%. We estimate that additional illegal -- or at least suspicious -- disposal accounts for 0.42 pounds per person per week, or 28% of the reduction in garbage observed at the curb.

Programming languages in economics: a comparison among Fortran77, C++, and Java

The main objective of this paper was to compare the computer programming languages Fortran77, C++, and Java under four aspects: runtime efficiency, readability, ease of learning, and reliability. For this comparison, we revised the specialized literature on programming languages and used pieces of codes of these three programming languages. The purpose of this comparison was to provide some objective information for economists interested in learning one or more of these languages.Programming language, Runtime efficiency, Readability, Reliability, Teaching/Communication/Extension/Profession,

GENERATION OF RECYCLABLES BY RURAL HOUSEHOLDS

Rising landfill costs have forced solid waste managers to consider ways to reduce the waste stream. Using survey data, models explaining the weight of recyclables generated by households are estimated for paper and glass. Results indicate that households respond to the time cost of recycling paper but not glass. The waste generation models imply total monthly willingness to pay for recycling is $5.78 per household. Waste managers may increase the weight of recycled waste stream with programs which lower perceived time costs of nonrecyclers and improve the efficiency of recyclers.Consumer/Household Economics, Environmental Economics and Policy,