^Thanks for your comment!
I actually copied it from the book on p. 121. Apart from that, I personally think that "may be" is correct if I am not mistaken.
However, I have to admit that there are some spelling mistakes and omitted words in my summaries.
I hope they're still useful apart from this issue. :)
something that I did not include but might be exam relevant is the % of employment (and perhaps of turnover as well) each of these types contribute to the total. You can find the numbers on p. 13 for this chapter and p. 37 for gazelles in chapter 2.