What is the average household income in the city known as "Danzig"?
average household income refers to avg_income_per_household; city known as "Danzig" refers to bad_alias = 'Danzig';
SELECT T2.avg_income_per_household FROM avoid AS T1 INNER JOIN zip_data AS T2 ON T1.zip_code = T2.zip_code WHERE T1.bad_alias = 'Danzig'