Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the area of the nation with GDP per capita (US$) of 11,929?

### Inputs:
table_name: table, columns: ['Member countries', 'Population', 'Area (km²)', 'GDP (billion US$)', 'GDP per capita (US$)']

### Response:
SELECT Area (km²) FROM table WHERE GDP per capita (US$) = 11,929