Notwithstanding that, this is likely to remain a relatively quiet corner of the market for some time given that the resources sector in general has been deleveraging following the end of the mining investment boom.
https://www.rba.gov.au/speeches/2019/sp-ag-2019-03-19.html  7/19  3/19/2019  Bonds and Benchmarks | Speeches | RBA  Graph 7  https://www.rba.gov.au/speeches/2019/sp-ag-2019-03-19.html  8/19  3/19/2019  Bonds and Benchmarks | Speeches | RBA  Graph 8  Despite 2018 being somewhat quiet, a diverse range of corporations have issued bonds. Last year, I showed some graphs of Herfindahl-Hirschman indices, which is a standard way of measuring concentration.