https://www.iso.org/files/live/sites/isoorg/files/store/en/PUB100456.pdf
https://ukandeu.ac.uk/our-economic-challenges-are-structural-borrowing-alone-wont-solve-them/?mc_cid=884875e416&mc_eid=815b1928ec
https://www.project-syndicate.org/commentary/global-economy-downside-risks-by-nouriel-roubini-2017-06