Concentration is the key to economic results. No other principles of effectiveness is violated as constantly today as the basic principle of concentration
Peter Drucker
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juni
14
2011
Concentration is the key to economic results. No other principles of effectiveness is violated as constantly today as the basic principle of concentration
Peter Drucker
Sommige dingen hebben wij in onze macht en andere niet. Als je iets begeert wat buiten je macht ligt, ben je gedoemd ongelukkig te worden. Epictetus |
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