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 furniture (market_rate INTEGER)

### Question ###
find the total market rate of the furnitures that have the top 2 market shares.

### Accurate SQL ###

SELECT SUM(market_rate) FROM furniture ORDER BY market_rate DESC LIMIT 2