| 34A12 | [] |
| 91G80 | [] |
| 97M30 | [] |
Summary: A mathematical method is presented, using functions stepwise defined over the time scale, which describes the development of share values on the base of detailed trading activities. Two simple relations, between the share value together with its time variation and the velocity or acceleration of trade stimulus, result in a non-linear first order differential equation, even providing simple analytical solutions in the case of constant parameters. With this equation a "steady" trading process can be defined, illustrated by characteristic examples. As a proof of the method, a fitting procedure on a real time series interval of the Frankfurt-Effekten- Fonds is demonstrated. Additionally to the steady trading process, "disturbing" activities can be taken into account, preferably in relationship to trade stimulus acceleration. From these a non-linear second order differential equation results, with solutions that also contain accelerated increases or diminished decreases of the share value during buying or selling, respectively - but in both cases with the implementation of possible destructive process instabilities, especially share value breakdowns. Some of the mathematical statements offer material for discussion from an economical point of view.