Which of the following statements is incorrect regarding international diversification?

Group of answer choices

International diversification should consider the type and weighting of industry sectors in each market.

International diversification across equities fails during market downturns.

International diversification leads to better improvements in the efficient frontier for investors in developing economies than for investors in developed economies.

International diversification improves the efficient frontier for investors in both developed and developing economies.

International diversification across sectors or across markets provides similar improvement in the efficient frontier.