9. (20) San Francisco is a city of contradictions: immense wealth and poverty, opulence adjacent to squalor, extreme technological innovation and policy that harkens back to the 1960s; rampant property crime and sky-high initial public offerings of corporations Recently, the city, citing the fact that many neighbourhoods in the city have seen the exodus of retail businesses (who have cited the difficulties of coping with violent or just squalid incidents) has considered a policy proposal, entitled the "Grocery Store Protection Act", which would require a closing store to provide the city six months' notice and try to find a replacement supermarket for the location that it is vacating. Using our tools, assess the impact this policy, if successfully implemented and enforced, will likely have upon the grocery market in San Francisco (effectively: WHN?)