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GTAP Resources: Frequently Asked Questions

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Memory RAM for full RunGTAP

I appreciate if anyone can give me hint regarding the amount of memory RAM we need to run the full RunGTAP. We're thinking in upgrading our computer systems and we have to consider the needs that models as RunGTAP and GTAPDyn impose. In particular we know that, for instance, the full RunGTAP model does not run in my PC with one giga memory -I get a message "unable to allocate sufficient memory. (I0STAT is 912)". Does anyone know how much memory is needed to run the full regional and sectoral specification model? In the case of GTAPDyn, how much is needed? Do you think it is advisable a more powerful computer like those with dou-processors? Are GEMPACK and RunGTAP compatible with UNIX? I have heard that is not feasible to expand the memory RAM further than 2 GB using the standard XP Professional, is that right? Overall, what do you advise: upgrade the memory RAM of the current PCs and run the models with UNIX or any upgrade WINDOWS or the acquisition of a type "server" system?

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How do I open HAR files?

How do I open HAR files?

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Difference with GDP numbers in GTAP

Why are the GDP (or other macro data) numbers in GTAP so much different from my country’s official statistic?

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Log-file warnings and re-ordering of data when I convert GTAP 8 Data Base in to GAMS format (GDX file)

I see some log-file warnings and re-ordering of data when I convert GTAP 8 Data Base in to GAMS format (GDX file). Is this a problem? How can I avoid this issue?

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GTAP 7 vs. GTAP 7.1 regions

Why does GTAP 7.1 Data Base have only 112 regions, though GTAP 7 Data Base has 113 regions?

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Decomposing trade effects of an FTA simulation

Is it possible to decompose the trade effects of an FTA simulation into trade diversion and trade expansion effects?

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Metadata description of GTAP data

Is there a metadata description of the GTAP data?

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Translating GTAP base data into CSV format

Is it possible to translate the GTAP base data into CSV format for loading into a different application, such as MS Access?

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Costs not matching with sales in GTAPVIEW file

Why don't the costs (computed from CM01) match with sales (computed from SF01) in the GTAPVIEW (gsdview.har) file?

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RORG

I try to impose a shock on rorg or globalcgds, but they are not in the default exogenous variable list. I checked equation RORGLOBAL, rorg should be exogenous when RORDELTA=1 or globalcgds is exogenous when RORDELTA=0. But they are both endogenous in the default closure. How can I exogenize rorg or globalcgds? I understand that total investment is constrained by total savings, but I could not find such an equation in GTAP tablo. The equation WALRAS would impose such constraint, but when ‘walraslack’ is endogenized in the default closure, this constraint breaks down. Could please tell me which equation shows the constraint of savings over investment so the ‘walraslack’ will be zero (when it is endogenized)?

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How to use GTAP Data Base for modeling applications?

How to use GTAP Data Base for modeling applications?

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Working with HAR files

How to open, read, convert or copy the contents from a HAR file

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GTAP Data Base Values

Are the values in the GTAP Data Base data or estimation results by GTAP Model? For example, I am checking GView, and there is a table called "NVFA". The table decomposes a total output into various inputs. Do the values in the table come directly from I-O table data? Or are they results of GTAP Model’s estimation? In this sense, I am not very sure about a relationship between GTAP Data Base and GTAP Model. Is there GTAP documentation which explains this point?

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Variable "to" defined with regards to "POS"

I am a new user of the standard GTAP model, which I am using to simulate a removal of EU argicultural subsidies on different EU agricultural sectors. Would it be possible for you to answer a couple of short questions that I have? 1) How is the variable "to" defined with regards to "POS" found in chapter 10C of the GTAP 7 documentation? 2) Is there a variable that corresponds directly to "POS"? 3) How is it that "to" is positive for certain agricultural subsectors, such as wheat in EU_25?

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Final/Intermediate Demand and Producer Taxes

There are several kinds of taxes included in the GTAP database. In most cases the tax base seems to be quite straight forward. However for several taxes we are uncertain which taxes were used as basis for the data given. Therefore my question: Is it indeed the case that the commodity taxes on: 1. intermediate usage on domestic products, 2. household consumption on domestic products, 3. investment usage and 4. government usage of domestic products represent a combination of VAT and e.g. consumption taxes on beer/tobacco? If so, how can we split those? ‘Domestic firm and investment tax’ would that be VAT only or does that include anything else as well? We understood that ‘ptax’ is a sort of producer tax. What does that exactly include? Excise tax?

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