什么是供给与需求模型?
<p><span word="The">The</span> <span word="Definition">Definition</span> <span word="and">and</span> <span word="Importance">Importance</span> <span word="of">of</span> <span word="the">the</span> <span word="Supply">Supply</span> <span word="and">and</span> <span word="Demand">Demand</span> <span word="Model">Model</span></p><p>供给需求模型的定义与重要性</p><p><span word="Forming">Forming</span> <span word="the">the</span> <span word="basis">basis</span> <span word="for">for</span> <span word="introductory">introductory</span> <span word="concepts">concepts</span> <span word="of">of</span> <span word="economics">economics</span>, <span word="the">the</span> <span word="supply">supply</span> <span word="and">and</span> <span word="demand">demand</span> <span word="model">model</span> <span word="refers">refers</span> <span word="to">to</span> <span word="the">the</span> <span word="combination">combination</span> <span word="of">of</span> <span word="buyers">buyers</span>' <span word="preferences">preferences</span> <span word="comprising">comprising</span> <span word="the">the</span> <span word="demand">demand</span> <span word="and">and</span> <span word="the">the</span> <span word="sellers">sellers</span>' <span word="preferences">preferences</span> <span word="comprising">comprising</span> <span word="the">the</span> <span word="supply">supply</span>, <span word="which">which</span> <span word="together">together</span> <span word="determine">determine</span> <span word="the">the</span> <span word="market">market</span> <span word="prices">prices</span> <span word="and">and</span> <span word="product">product</span> <span word="quantities">quantities</span> <span word="in">in</span> <span word="any">any</span> <span word="given">given</span> <span word="market">market</span>.</p><p>作为经济学入门概念的基础，供给需求模型指的是：买方的偏好构成了需求，卖方的偏好构成了供给，而两者结合起来决定了商品在任意市场形态中的价格和数量。</p><p><span word="In">In</span> <span word="a">a</span> <span word="capitalistic">capitalistic</span> <span word="society">society</span>, <span word="prices">prices</span> <span word="are">are</span> <span word="not">not</span> <span word="determined">determined</span> <span word="by">by</span> <span word="a">a</span> <span word="central">central</span> <span word="authority">authority</span> <span word="but">but</span> <span word="rather">rather</span> <span word="are">are</span> <span word="the">the</span> <span word="result">result</span> <span word="of">of</span> <span word="buyers">buyers</span> <span word="and">and</span> <span word="sellers">sellers</span> <span word="interacting">interacting</span> <span word="in">in</span> <span word="these">these</span> <span word="markets">markets</span>.</p><p>在一个资本主义社会中，价格并不是由一个中央权威制定的，而是这些市场中买方和卖方互动的结果。</p>
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