If we keep selling all our companies to foreign owners we won't have any proprietary technology of strategic or national importance to protect, nor will we obtain any.  We do need 'tit for tat' so that Canadian equipment and technology suppliers to the construction industry have access to Chinese markets in the same way that Chinese equipment and technology suppliers would have access to our markets.  And the same goes for American buyers.  To be honest, we're best to trade with countries that punch our weight, in Europe, and Asian countries other than China.