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♪ [música] ♪

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- [Alex] En economía

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seguramente escucharás mucho
la palabra "marginal",

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beneficio marginal,

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costo marginal

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ingreso marginal --

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y la lista continúa...

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¿Qué es pensar en el margen?

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¿Y por qué es importante?

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Marginal significa

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un poco más
o un poco menos.

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Imaginemos que ves una película

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y no puedes oír el diálogo.

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Aumentas el volumen un poco.

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[voces de una película]

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¿Qué tan alto debería ser?

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Bueno, esa es una pregunta 
para comparar el beneficio marginal

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con el costo marginal
de aumentar el volumen.

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El primer tramo hacia arriba
suena bien.

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Ahora se puede escuchar
lo que los actores dicen.

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[voces se oyen más claras]

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Lo subes otro tramo.

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[voces altas]

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Las bocinas ya distorsionan un poco,
pero aún así lo prefieres así.

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[voces con volumen muy alto]

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Un poco más.

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[explosión sonora]

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¡Oh!

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Ahora hay una escena de acción.

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¡Es demasiado alto!

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¡No querrás despertar
a tus compañeros de cuarto!

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Así que disminuyes
un poco el volumen.

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[voces más bajas]

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Continúas así

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haciendo ajustes marginales
hacia arriba y hacia abajo,

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comparando el margen de beneficio
contra el margen de costo,

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a cada paso del camino.

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Pensar en el margen

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es comparar beneficios
de la siguiente decisión con su costo.

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Nota que pensar en el margen --

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es un método o forma de llegar

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a la mejor
o a una decisión óptima.

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