The stock theory based on modern portfolio theory,however,argues that a change in the interest ratedifferential will only lead to an adjustment in portfolios of assets as a new stock equilibrium is established.

• 在资产组合理论基础上发展起来的国际资产组合理论引入了资产的风险性、投资者的偏好及各种资产预期收益的相关性等因素，解释了国际间的相互投资。