# Joachim KaldaschEBC Hochschule Berlin

Joachim Kaldasch

Dr.

## About

37

Publications

5,043

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174

Citations

Citations since 2017

Introduction

Data Analysis
Data Science

Additional affiliations

January 2000 - present

## Publications

Publications (37)

Presented is an analytic dynamic model of the price dispersion of consumer products. The theory is based on the idea that sellers offer product units for a profit maximizing price, denoted pm. Product units not sold at pm are called excess units. Based on the conservation equation of offered units, it can be shown that the stationary price distribu...

Das vorliegende Buch nutzt das betriebswirtschaftliche Produktlebenszyklus-Konzept und verallgemeinert es zu einem mikroökonomischen Lebenszyklus-Konzept von Gütern und Produkten. Zentral steht die Modellierung des Reproduktionsprozesses um, die Absatz-, Angebots- und Preisentwicklung häufig gekaufter Produkte und Güter zu beschreiben. Außerdem wer...

A dynamic microeconomic model is presented that establishes the price and unit sales evolution of heterogeneous goods consisting of successive homogenous product generations. It suggests that for a fast growing supply the mean price of the generations are governed by a logistic decline towards a floor price. It is shown that generations of a hetero...

established. It describes the concurrent evolution of the unit sales and price of durable goods. The
theory is based on the idea that the sales dynamics is determined by a meeting process of
demanded with supplied product units. Taking advantage from the Bass model for first purchase
and a logistic model for repurchase the entire product lifecycle...

A new microeconomic model is presented that aims at a description of the long-term unit sales and price evolution of homogeneous non-durable goods in polypoly markets. It merges the product lifecycle approach with the price dispersion dynamics of homogeneous goods. The model predicts a minimum critical lifetime of non-durables in order to survive....

Presented is an analytic microeconomic model of the temporal price dispersion
of homogeneous goods in polypoly markets. This new approach is based on the
idea that the price dispersion has its origin in the dynamics of the purchase
process. The price dispersion is determined by the chance that demanded and
supplied product units meet in a given pri...

A model of shear thickening in dense suspensions of Brownian soft sphere colloidal particles is established. It suggests that shear thickening in soft sphere suspensions can be interpreted as a shear induced phase transition. Based on a Landau model of the coagulation transition of stabilized colloidal particles, taking the coupling between order p...

A dynamic microeconomic model is presented that establishes the price and unit sales evolution of heterogeneous goods consisting of successive homogenous product generations. It suggests that for a fast growing supply the mean price of the generations are governed by a logistic decline towards a floor price. It is shown that generations of a hetero...

The paper presents an evolutionary economic model for the price evolution of stocks.
Treating a stock market as a self-organized system governed by a fast purchase process
and slow variations of demand and supply the model suggests that the short term price
distribution has the form a logistic (Laplace) distribution. The long term return can be
des...

An evolutionary model of the city size distribution is presented that explains the size of a city from the reproduction process and the migration of humans between cities. The model suggests that the city size distribution is a lognormal distribution with a power law tail in agreement with empirical results and computer simulations. The main idea o...

Moore suggested an exponential growth of the number of transistors in integrated electronic circuits. In this paper, Moore’s law is derived from a preferential growth model of successive production technology generations. The theory suggests that products manufactured with a new production technology generating lower costs per unit have a competiti...

An evolutionary model of the bank size distribution is presented based on the exchange and creation of deposit money. In agreement with empirical results the derived size distribution is lognormal with a power law tail. The theory is based on the idea that the size distribution is the result of the competition between banks for permanent deposit mo...

Landau theory is presented for the structural transition of electrically stabilized colloidal crystals under shear. The model suggests that a structural transition from an ordered layered colloidal crystal into a disordered structure occurs at a critical shear stress. The shear induced structural transition is related to a change of the rheological...

Es wird eine kurze Zusammenfassung der Theorie des Produktlebenszyklus unter Berücksichtigung der evolutionären Diffusion von Gebrauchsgütern gegeben. Der Prozess der Ausbreitung innovativer (Marken-) Produkte und Dienstleistungen auf einem Markt wird als Diffusion bezeichnet. Der Titel enthält jedoch zusätzlich den Terminus "evolutionär" der dem L...

Presented is an evolutionary model of consumer non-durable markets, which is an extension of a previously published paper on consumer durables. The model suggests that the repurchase process is governed by preferential growth. Applying statistical methods it can be shown that in a competitive market the mean price declines according to an exponenti...

In this paper a Time Dependent Ginzburg-Landau (TDGL) model for shear
thickening of electrically stabilized colloidal suspensions is developed. It is
based on the idea that a stressinduced critical slowing down of the density
mode along the compression axis of the sheared suspension (compression mode)
causes jamming and is the key variable to under...

The key idea of this model is that firms are the result of an evolutionary process. Based
on demand and supply considerations the evolutionary model presented here derives
explicitly Gibrat’s law of proportionate effects as the result of the competition between
products. Applying a preferential attachment mechanism for firms, the theory allows to
e...

The aim of this work is to establish the personal income distribution from
the elementary constituents of a free market; products of a representative good
and agents forming the economic network. The economy is treated as a
self-organized system. Based on the idea that the dynamics of an economy is
governed by slow modes, the model suggests that fo...

An evolutionary model of the product life cycle is applied to derive the experience curve and the market size of (expensive) durable goods. The experience (learning) curve suggests that the real costs per unit decrease with an increasing cumulative output (Henderson's law). Based on the idea that in a competitive market firms are forced to pass cos...

The model presented here derives the product life cycle of durable goods. It
is based on the idea that the purchase process consists of first purchase and
repurchase. First purchase is determined by the market penetration process
(diffusion process), while repurchase is the sum of replacement and multiple
purchase. The key property of durables good...

The model suggests that after introduction goods spread always according to a Bass diffusion.
However, this phase will be followed by a diffusion process for durable consumer
goods governed by a variation-selection-reproduction mechanism and the growth dynamics
can be described by a replicator equation.
The theory suggests that products play the ro...

This paper adopts a previously developed activation model of shear thickening, published by the authors to sterically stabilized
colloidal suspensions. When particles arranged along the compression axis of a sheared suspension, they may overcome the repulsive
interaction and form hydroclusters associated with shear thickening. Taking advantage of t...

This paper exposes an extension of an activation model previously published
by the authors. When particles arranged along the compression axis of a sheared
suspension, they may overcome the electrostatic repulsion and form force chains
associated with shear thickening. A percolation based consideration, allows an
estimation of the impact of the for...

The authors previously introduced an activation model for the onset of shear thickening in electrically stabilized colloidal suspensions. It predicts that shear thickening occurs, when particles arranged along the compression axis in a sheared suspension do overcome the electrostatic repulsion at a critical shear stress, and are captured in the pri...

The authors previously introduced an activation model for the onset of shear
thickening in electrically stabilized colloidal suspensions. It predicts that
shear thickening occurs, when particles arranged along the compression axis in
a sheared suspension do overcome the electrostatic repulsion at a critical
shear stress, and are captured in the pri...

A theory is presented for the onset of shear thickening in colloidal
suspensions of particles, stabilized by an electrostatic repulsion. Based on an
activation model a critical shear stress can be derived for the onset of shear
thickening in dense suspensions for a constant potential and a constant charge
approach of the spheres. Unlike previous mo...

A model is presented that predicts the critical shear rate of shear thickening of soft sphere colloidal suspensions. It is based on the idea that shear in a colloidal crystal leads to a periodic variation of the elastic modulus with time. At a specific shear rate an acoustic resonance occurs which leads to an increase of the viscosity. Good agreeme...

A second-order perturbation theory based on statistical thermodynamics is employed to calculate the phase diagram of suspensions of charge-stabilized, monodisperse, spherical, colloidal particles that are assumed to interact by a standard DLVO potential. Taking into account van der Waals forces, the phase diagram consists of an ordered colloidal cr...

The electronic and magnetotransport properties of conduction electrons in the grain boundary interface of p-type Hg1−xCdxTe bicrystals are investigated. The results clearly demonstrate the existence of a two-dimensional degenerate n-type inversion layer in the vicinity of the grain boundary. Hydrostatic pressure up to 103 MPa is used to characteriz...

In recent years heterogeneous catalytic reaction systems have been shown to produce a complex dynamic behavior. For example the heterogeneous catalytic oxidation of ethanol on palladium was found to exhibit multistability as well as relaxation oscillations (Jaeger., 1986, Ber. Bunsenges. phys. Chem.90, 1075–1079; 1990, Chem. Engng Sci.45, 947–953)....

The electronic and magnetotransport properties of conduction electrons in the grain boundary interface of p-type Hg1−xCdxTe bicrystals are investigated. The results clearly demonstrate the existence of a two-dimensional degenerate n-type inversion layer in the vicinity of the grain boundary. The observed quantum oscillations of the magnetoresistivi...

Communication and similar markets can only be understood thoroughly if network effects are taken into account. For an oligopolistic market without com-petition, a static mathematical model is derived. This discrete model allows to analyse in detail marginal utility and net gain for a network as well as its critical sizes and limit of growth or satu...

## Projects

Project (1)