In an article of The Economist
:
Germany’s chancellor, Angela Merkel, is said to be wrestling with how to position her country in an age of sharp competition between two self-interested giants, America and China.
Her choices have been narrowed by a loss of faith among Germany’s elite in the claim, once touted as “change through trade”, that com- merce with China will nudge that country towards openness and democracy.
What does "in the claim" mean here?