These days there's virtually no difference employability wise between doing a Bachelor of Arts and majoring in Economics vs a BCom. Do a BA, work hard and if you can't get the WAM to transfer (eg. <65) then even if you started off in BCom you would find it difficult to find a good job. A Business degree at Monash is less employable at many places than a Bach Arts at Melb.
I agree, but this is only for some of the top tier "Big 4" auditing firms. (however, I do know a lot of people who got positions going to La Trobe University and Deakin University - they had really good extra-curricular activities though). Ultimately it comes down to what you want to do after Uni, plenty of the Big 4 firms state that they aren't accounting firms and want people with a variety of skills. At this day and age and where the world is heading, I'd almost recommend people to stay clear of generic commerce or business degrees and pick up a science degree specialising in some form of IT or Mathematics discipline. The industry needs people to be very, very good with computers and just knowing how to use the Microsoft Suite really won't save you in the long run as everything will be automated. So to save yourself, I'd strongly recommend completing a Computer Science degree or if that's not your cup of tea, do the Diploma in Mathematics on the side of whatever you are doing. Having some STEM skills will really open up the job market for you and separate you from the other Commerce students.
As someone who interviews students for graduate positions, barely any student has experience using applications aside from Word and Excel. You will be strongly considered if you've used applications that are used in the real world e.g. Accounting - MYOB and Xero. Data Science - Python, R, SAS, SPSS etc. I understand universities don't place a lot of emphasis on this (They should though), but even going out of your way to learn these things will really, really separate you from the other graduates.
TL:DR. Your degree doesn't really matter for general graduate positions, particularly at Big 4 firms, however getting experience related to the industry is highly sought after, and we will choose someone who has experience with these applications (even if it's self-taught - we will test you on it though) with a 70 WAM vs. someone who has zero experience with an 85 WAM. It's sad, but it's true. So ultimately think about what you want to do and really find out what you'll be doing in the position so you can start building your resume around that.