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 product_suppliers ( product_id VARCHAR, total_amount_purchased VARCHAR )

### Question ###
What are the ids of the top three products that were purchased in the largest amount?

### Accurate SQL ###

SELECT product_id FROM product_suppliers ORDER BY total_amount_purchased DESC LIMIT 3