The trend of population aging is affecting an increasing number of countries around the world, especially advanced economies. One consequence of a growing population share of aged persons is a shift in consumer needs, reflected by a rising number of products and services designed particularly...

According to the Great-Man Theory, the creation of something new used to be accredited solely to one outstanding individual: the champion. This prevailing notion in Angloamerican research was first challenged by Witte (1973), who concluded that an innovation cannot be a one-man decision, since...