Comments on the Future of VORSIM by Vernon Oley Roningen
Support: VORSIM has evolved along over the years as its host, the Microsoft Excel spreadsheet has evolved. It also has evolved because of the need to address new kinds of modeling problems. The current version, VORSIM 15, uses Excel 2013 or 2016 and is better and more powerful than earlier versions (1-14). I will provide support for VORSIM 15 but no longer for version 14 (which still may be purchased). Even to deal with a model problem in earlier versions such as 14, it is easier to convert the model to version 15 and work with it there. VORSIM 15 should be compatible with newer versions of Excel to come, but time will tell.
Upgrades: There has never been an upgrade policy for VORSIM since an upgrade is technically difficult in VBA and the cost of the newer VORSIM version has been low. It is much cheaper for you to buy the new version of VORSIM than what I would charge for a manual upgrade.
Spreadsheet modeling: Models are created in Excel using its equation and Visual Basic capability. As manually-built Excel models become larger, it becomes difficult to keep track of variables and data. VORSIM software imposes some structural regularity during the model-building process. The result is that you always know exactly where your data and equations are located and the variable nomenclature reflects this model structure. A VORSIM model structure follows the spreadsheet structure. So VORSIM changes a modeling effort to a structured one rather than an ad hoc creation of variables and equations in spreadsheets. In addition, VORSIM makes it relatively easy to use complex spreadsheet features such a pivot tables for examining model solutions. Complex equations are written with the click of a button rather than having to be entered manually by hand.
Advantages: VORSIM has been mainly used for partial equilibrium modeling around available data sources. The strength of VORSIM lies in its ability to help organize a model and its data and to quickly repeat many model building operations. It is no exaggeration that most VORSIM models I have built have been reconstructed from scratch many times before they are acceptable. However this is easy because data and equations once created and backed up, can be restored at the click of a button. VORSIM simplifies the mechanics of model building leaving more time to think for the model builder. Of course a good modeling system such as VORSIM cannot fix a badly created model; building a good useful model is the task of the model builder in any modeling system.
Criticisms: Critics have said that VORSIM models are too ad hoc or are not adequate because they are not general equilibrium. While these criticisms may be true, an understandable VORSIM-built model is very useful for meeting analytical deadlines for a problem. A useful model is a) one that works, b) one that the builder understands, and c) one that can be clearly explained to others and d) one that delivers results when needed. Furthermore the most important product of a VORSIM model-building effort is the education of the builder when he is forced to test his hunches against real data and rational equation structures. General equilibrium models are costly but useful for what they are and for the sector breakdown that they contain. But tacking on problems to a fixed sector CGE model also can be an ad hoc procedure.
The Future: I assume that VORSIM version 15 for Excel 2013 is as advanced as it can be for now. Although version 15 probably still has some bugs in seldom used routines, the routines to build and simulate models are the best ever.
The Business: VORSIM as a consulting business will survive for a year or two. If someone wants to purchase the business, what does it consist of? A trademarked name (VORSIM), patented software (VORSIM modeling software), and sample models. For someone to use VORSIM in a consulting business requires a lot of VORSIM model-building experience. When my VORSIM business will close in a year or two, further support and development may not be done by me. Offers to buy the VORSIM software (unlocked for further development) will be considered with a minimum bid of $25,000.