The hiring process can be an expensive and time consuming process for a company. For instance, running an ad online and in the newspaper can easily cost a company over $1000. Add to that time spent sorting thru resumes, holding interviews and doing background checks - it totals up very quickly!
The sooner they find the right person, the sooner their job is done!
When you go into an interview, remember the person interviewing you WANTS you to be the right person. They WANT to be done with the search. They WANT to place you in that job!

