Power is a central phenomenon in human societies. Sociologists, politicians, philosophers in all cultures try to understand emergence and change processes of power. What was missing for a long time is measurement of power. First attempts were made in the last decades. This contribution...

Efficiency is the main issue in any data envelopment analysis. Realizing output by a minimum of input or reaching a maximum of output by a given input is the credo, scale effects often are only a sort of accessory. In modern economics scale effects play a prominent role, however. What is the...

In data envelopment analysis (DEA), returns to scale (RTS) are a widely accepted instrument for a decision-making unit (DMU) to reveal its activity scaling potentials. In the case of increasing returns to scale (IRS), a DMU learns that upsizing activities improves its productivity. For...

Duality for linear vector optimum problems is often just a mathematical construct (l'art pour l'art). We define a family of dual problems to support decision-makers in a concrete economic situation. Entrepreneurs generally want to participate in initiatives for producing new products with...