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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос: В 2011г. была выложена для решения задача Уравнение функции спроса имеет вид Q(d)=300-5*P Коэффициент точечной эластичности E=(-1)/(4,9) Определить цену, по которой будет реализовываться товар. Определить, эластичен ли спрос на товар и что следует порекомендовать продавцу: поднимать или снижать цену на реализуемую продукцию."Консультирует lamed (Академик): Здравствуйте, Чаркин Иван Александрович! По определению, точечная эластичность E=(dQ/dP)*(P/Q) 1.Найдем Q dQ/dP=d(300-5*P)/dP=-5 -1/4.9= -5*(P/Q) Q=24.5*P С учетом Q=300-5*P, получим P=300/19.5=15,8
2. Условие максимизации выручки d(TR)/dP =0, Здесь TR=Q*P=(300-5*P)*P d(TR)/dP=300-10*P=0, P=30 Таким образом, цену следует увеличить до 30 ден. ед.
3.Поскольку 0<|e|<1, спрос неэластичный Если требуются пояснения, задавайте вопросы в мини-форуме."
Помогите пожалуйста понять, в пункте 1), где получилось -5, как вышло такое число и что сокращали? У меня точно такая же задача, только уравнение функции Q(d)=300-21*P , а коэффициент точечной эластичности E=(-5)/(4,9) Заранее спасибо.
Строчкой выше написано dQ/dP=d(300-5*P)/dP=-5. То есть это производная функции Q по P. Функция линейная, производная равна коэффициенту при P, то есть -5
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