“…Professional investors perform a less pure version of award-winning scientific financial arbitrage theory to correct price discrepancies in similar assets (Beunza et al, 2006). Last but not least, retail and professional investors use technical analysis (Roscoe, 2015, Thompson, 2013, which modern finance theory condemns as 'astrology' in efficient markets (Fama, 1995) but sociological research (Preda, 2004) demonstrates to be similar to scientific methods in its 'techniques of theorisation' (Callon, 2007). There are also practitioner models, blending scientific and practitioner theories and helping market actors value and forecast individual assets, for example, discounted cash flow (DCF) in the so-called 'fundamental analysis' (Fama, 1995), and calculate probabilities of market events and discern how others do it as a 'coordinating device', for example, 'spreadplot and implied volatility' (Beunza and Stark, 2012).…”