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Partners Healthcare

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Submitted By IrisFrontanilla
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Pregunta 1
Suponga que diferentes hospitales dentro del sistema Partners eligen diferentes combinaciones del portafolio “libre de riesgo” STP y del portafolio base LTP, cuyos retornos esperados y niveles de riesgo aparecen en la tabla 3 (Exhibit 3). Grafique los niveles de retorno y riesgo para distintos portafolios que se puedan formar combinando STP y LTP. ¿Qué forma toma la curva que se genera al unir con una línea las diferentes combinaciones posibles de riesgo y retorno? ¿Por qué? ¿Cómo se compara la curva anterior con la que surgiría si los hospitales decidieran invertir solamente en STP y en Acciones de EE.UU?
Exhibit 3

Calculando el retorno y desviación estándar del portafolio LTP y STP tenemos:

Por tanto en resumen tenemos:

Asignamos proporciones tanto a LTP y STP de acuerdo a………

Y tenemos lo siguiente:

¿Qué forma toma la curva que se genera al unir con una línea las diferentes combinaciones posibles de riesgo y retorno? ¿Por qué? ¿Cómo se compara la curva anterior con la que surgiría si los hospitales decidieran invertir solamente en STP y en Acciones de EE.UU?

La forma que adopta la curva de las distintas combinaciones de los portafolios STP Y LTP es la de una recta creciente que parte desde el retorno del portafolio libre de riesgo, idéntica a la recta de mercado de capitales del modelo de Markowitz. La razón por la que toma esta forma está determinada por la incorporación en el portafolio de un activo libre de riesgo, en este caso de un portafolio libre de riesgo y un portafolio riesgoso. La curva muestra la relación entre el retorno esperado del nuevo portafolio (formado por STP y LTP) y el riesgo esperado medido en este caso a través de la desviación estándar. Dentro de esta recta se encuentra el portafolio optimo cuyo punto es tangente con la frontera de eficiencia que se podría formar con las

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