GEMPACK ——一般均衡建模软件包


可计算的一般均衡(Computable General Equilibrium)模型,简称 CGE 模型,是一种基于投入产出表、具有丰富理论结构的实证模型。该方法在经历 60 年代的短暂沉寂后,自90 年代开始,迅速成为政策分析的重要方法,广泛应用于贸易政策、税制改革、环境能源、产业政策等方面的分析。在国内,对这种分析方法的关注正呈上升趋势,一些政府机构、科研单位和高等院校正努力加强这方面的研究。

GEMPACK (General Equilibrium Modelling PACKage) 是多用途的经济建模软件包,特别适用于一般和局部均衡模型,已被全球400余家机构广泛地使用。GEMPack 可以求解各种类型的 CGE 模型,并且具有求解过程简单、可变动模块,及适用于政策分析等特点。它可以处理广泛的经济行为。
GEMPack 求解非常大型的非线性等式系统。


-GEMPack 软件可以计算出经济模型的精确解答。

-GEMPack 的 Windows 程序使得在 Windows PC 上的使用很简单。

-GEMPack 还包含了求解跨期模型(intertemporal model)的强大功能。


GEMPack Executable-Image Version 软件包含:原厂CD+全套手册(8本)

GPD-1 An Introduction to GEMPACK;
GPD-2 TABLO Reference;
GPD-3 Simulation Reference: GEMSIM, TABLO-generated Programs and SAGEM;
GPD-4 Useful GEMPACK Programs;
GPD-5 Release 9 of GEMPACK: New Features and Changes from Release 8.0
GPD-7 Installling and Using the Executable-Image Version of GEMPACK on Windows PCs;
GPD-8 Getting Started with GEMPACK: Hands-on Examples;
GPD-9 Release 10.0 of GEMPACK: New Features and Changes from Release 9.0

GEMPACK (General Equilibrium Modelling PACKage) is a suite of general-purpose economic modelling software especially suitable for general and partial equilibrium models.

GEMPACK software is being used in over 400 organizations around the world (universities, government departments and private sector firms), about two thirds of which are outside Australia. It is used to implement and solve a number of economic models.

The software is user-friendly, and fully documented from a user’s point of view. Training courses and user support are available from the Centre of Policy Studies, Monash University. These include the Practical General Equilibrium Modelling Course as well as courses in dynamic and multi-regional modelling. More details of forthcoming courses are here.

GEMPACK provides a number of features designed to make this sort of modelling easier.

GEMPACK runs on a variety of different machines.

Several papers about GEMPACK are available.

Models Implemented and Solved using GEMPACK

GEMPACK software is used in over 400 organizations around the world (universities, government departments and private sector firms) to implement and solve a number of economic models including:
several single-country models (of which the ORANI and MONASH models of the Australian economy are perhaps the best-known),
multi-country trade models, of which GTAP developed by the Global Trade Analysis Project (Purdue University, Director: Thomas W. Hertel) is perhaps best known,
regional models, such as the MMRF and TERM models,
intertemporal (or dynamic) models (with forward-looking behaviour), and
recursive dynamic models such as MONASH, ORANIG-RD and GTAP-Dyn (the dynamic version of GTAP).

Example models supplied with GEMPACK include
small teaching models (Stylized Johansen, Miniature ORANI),
multicountry trade models (TRADMOD, GTAP),
single-country models DMR (Korea) and ORANIG (Australia and many other countries), and small intertemporal models (TREES, CRTS and 5SECT).

Example models available from the GEMPACK web site include
The recursive, dynamic version ORANIG-RD of ORANI-G. This can be used with the Demonstration Version of RunDynam.
The recursive, dynamic MONASH Model of Australia. This can be used with the Demonstration Version of RunMONASH.
You can replicate the main application in the MONASH Model book.

A fully intertemporal, rational expectations version ORANI-INT of ORANI.
Features of GEMPACKGEMPACK provides a simple language to describe and document the equations of an economic model. The equations can be non-linear levels equations, a linearised representation of the model, or a mixture of these two. A preprocessor (the program TABLO) is used to convert the equations to a form ready to run simulations with the model.

The program TABLO includes a condensation facility which makes it possible to solve very large models. Algebraic substitutions can be made symbolically in the system of linearized equations to reduce the system actually solved to a manageable size.

Using simple text files (Command files), it is easy to specify and carry out simulations. For example, there are options for varying the choice of exogenous and endogenous variables, and the variables shocked.

Algorithms in the simulation programs give increased accuracy in solution of the non-linear equations, by using multi-step simulations, extrapolation, subintervals and automatic accuracy techniques.

A generic simulation program, GEMSIM, can be used to solve all economic models. For larger models, compiled model-specific programs can be used to run simulations at increased speed.

GEMPACK contains utility programs to assist in managing the data base on which the model is based. The data can be inspected, modified, converted to spreadsheets or moved to different machines (including those with different operating systems).

On PCs running Windows XP or later, a Windows interface (WinGEM) can be used to run simulations and other programs. There are several other Windows programs to view data (ViewHAR) and simulation solutions (ViewSOL), and a text editor designed specifically for GEMPACK (TABmate).

GEMPACK is fully documented and has detailed examples to help new users.
Different Versions of GEMPACKThere are several different versions of GEMPACK, but they all allow you to use and modify existing models or to build new models. The main difference between the versions is the size of the models they can handle.

The Limited Executable-Image Version can only handle medium-sized models. That means single-country models with up to about 40 sectors or multi-regional models with up to about 9 or 10 regions and sectors. Those wishing to find out more about GEMPACK may download a 3-month free trial of this version.

The Source-Code Version and the Unlimited Executable-Image Version can handle models of any size. You are limited only by the amount of memory on your computer. The main difference between the Source-Code Version and the Unlimited Executable-Image Version is that the Source-Code Version solves large models much more quickly than the

Unlimited Executable-Image Version.
Which Version is Most Appropriate for My Needs?TeachingThe Limited Executable-Image Version is ideal for use in teaching, including in a computer laboratory. We use the Limited Executable-Image in our annual courses.

Beginning ModellerThe Limited Executable-Image Version is a good starting point. If your models become too large you can upgrade to the Unlimited Executable-Image Version or to the Source-Code Version later.

Academic or PhD Student Building Your Own ModelEither the Unlimited Executable-Image Version or the Source-Code Version is what you will probably need.

Policy AnalysisFor government departments, research institutes, private sector organisations or academics using large models, the Source-Code Version is most appropriate.

Working with the GTAP ModelIf you are interested in GEMPACK in order to work with the GTAP model, click here for advice on which version of GEMPACK is appropriate for your needs.

GEMPACK LicencesEach GEMPACK Version has its own type of licence. In addition there is an Introductory GEMPACK licence.

Individual and Site LicencesIf you purchase the Source-Code Version, your licence will be a site licence. A site licence can be used by any number of modellers within the relevant part (department, centre etc) of your organisation.

The Limited Executable-Image is available either as a site licence or as a single-user licence.
The Unlimited Executable-Image Version is only available as a single