How much is Tuvalu economy worth?

Could you elaborate on the economic value of the Tuvalu economy? Specifically, what is its estimated gross domestic product (GDP), and how does it compare to other small island nations? Also, considering its geographical location and resource constraints, what are the main economic activities that contribute to its overall economic worth? Furthermore, are there any specific policies or initiatives that the government of Tuvalu has implemented to boost its economic growth and prosperity? Understanding these factors would help us gain a more comprehensive view of the economic status of Tuvalu.