Under certain conditions, the ratio between profit dedication and advertising cost should be equal to the point of equilibrium of advertising investment.
在一定条件下，利润贡献与广告成本的比值等于广告投入保本点的销售量。
However, as the substitutable relationship between liquidity and profitability, the bank should choose a equilibrium point so as to maximize profit, which is analyzed by indifference curve.
但是，流动性和收益性之间存在着替代性的关系，通过无差异曲线的分析说明银行为了保证效用最大化，必须在流动性和收益性之间选择一个均衡点。
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