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_15813 ( "Department" text, "Head" text, "Full professors" real, "Honorary professors" real, "Lecturers" real )

### Question ###
What is the average number of honorary professors in the economics department with 1 lecturer?

### Accurate SQL ###

SELECT AVG("Honorary professors") FROM table_15813 WHERE "Lecturers" = '1' AND "Department" = 'economics'