business businessstudies decision-making economics entrepreneurship entreprenörskap framgångsriktföretagande generalinterests gestiond'entreprise hobbies industrialmanagement industrialproductivity inspirational klein-undmittelbetrieb leadership management motivation motivational newbusinessenterprises newyorktimesbestseller newyorktimesreviewed nyt:advice-how-to-and-miscellaneous=2019-11-17 personalsuccess principlesofmanagement problemsolving selbstständiger self-help self-helpgeneral skills specialtopics success successinbusiness unternehmensgründung