Vieira Proves Goldman Sachs Analysis Sheer Incompetence on First Solar. In one of the best market calls for the year, investing in solar stocks crash, one of our complimentary investment strategic decisions, the team warned investors multiple times for Goldman Sachs dirty secrets and sheer incompetence. stockmarketlive.tv/2016/05/16/vieira-proves-goldman-sachs-analysis-sheer-incompetence-first-solar/