Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_3448 ( "Country" text, "Population in 2011 (In thousands)" real, "GDP (nominal) in 2011 ( USD millions)" real, "GDP (nominal) per capita" real, "GDP (PPP) in 2011 ( USD millions)" real, "GDP (PPP) per capita" real, "Merchandise exports ($ billions), 2011" text, "Merchandise imports ($ billions), 2011" text, "Exports to Mercosur (% of each, 2010)" text, "Imports from Mercosur (% of each, 2010)" text )

### Question ###
What is the GDP (ppp) in 2011 when the imports from Mercosur is 48.8?

### Accurate SQL ###

SELECT MIN("GDP (PPP) in 2011 ( USD millions)") FROM table_3448 WHERE "Imports from Mercosur (% of each, 2010)" = '48.8'