Think of it this way, if 10 people hear of an inspiring story and they're inspired to share it, on average, with nine other people, that story actually will pretty quickly fizzle away.
Piénsalo de esta manera: si 10 personas se enteran de una historia inspiradora y se sienten inspiradas para compartirla, en promedio, con otras nueve personas, esa historia desaparecerá rápidamente.