AI expenses in technology firms reduce net income and distort PE ratios, making these companies appear more expensive on earnings-based metrics despite the fact that those expenses are creating valuable intangible assets.

Jacob does not favor frequent or drastic strategy re-evaluation; it would be highly unusual to re-evaluate an entire strategy more than once every couple of years; the focus is instead on identifying when model assumptions fail and adjusting positions accordingly, not wholesale strategy changes.

Jacob emphasizes that new hires to Bridgeway should focus intensively on understanding data quality, complexity, and nuances (especially international data) and on reading academic literature before attempting optimization or portfolio management, because foundational knowledge is critical to later success.

Long-short strategies allow portfolio managers to mitigate systematic exposures (country, sector, beta, size) much more effectively than long-only strategies because shorts are not constrained by index weights; managers can short out unwanted sector or country exposures rather than merely underweighting them.

When running a long-short strategy, assumption failures and external risks are more critical on the short side than the long side because the potential loss asymmetry from shorts is substantially larger than from longs, requiring more careful monitoring of short-side model assumptions.

Price-to-Book should be viewed as a risk factor rather than an alpha factor in portfolio construction, particularly for high-intangible companies, which has changed the way Bridgeway builds portfolios since this pattern became overwhelmingly true after 2007.

Capitalized intangible asset intensity (excluding goodwill) as a proportion of total assets doubled from 1994 to 2018; R&D expenses as a proportion of total revenue increased by 50% over the same period; while SG&A expenses as a proportion of total revenue remained quite stable.

Intangible intensity has increased more substantially in international companies compared to US companies, which was a surprising finding even after adjusting for industry composition differences.

Approximately 85% of Bridgeway's portfolio management process is systematic while 15% is discretionary, with the discretionary portion focused on identifying assumption failures and externalities (like meme stocks, M&A activity, or government regulations) that require muting the systematic signals.

Long-short strategies allow for more effective mitigation of systematic exposures compared to long-only strategies because they eliminate index underweight constraints and enable direct control of country exposures, sector exposures, size exposures, and price-to-book exposures to near-zero levels.

Jacob's primary investment recommendation for average investors is to stay humble about trading, assuming the counterparty has more information and skills, and ensuring every trade makes strong sense; for quants specifically, it is critical to always question the assumptions of models rather than blindly following stock screens.

Sentiment-based analysis requires understanding what sentiment is already priced into a stock and what sentiment is not priced in, with opportunities existing only in unprice sentiments.

Standard reported short interest data has funky distributions that make it difficult to extract alpha, whereas prime broker daily short availability data has superior distribution characteristics that make alpha extraction more feasible.

The research on intangible capital intensity was conducted as a collaboration between Jacob Pizar, Amitab Dugar, and Andre Burkin and was published in the Financial Analyst Journal.

Jacob would not typically re-evaluate an entire strategy more than once every couple of years, which would be very unusual, preferring to focus team effort on understanding when specific model assumptions fail.

Currency hedging is expensive and investors wanting to diversify should diversify into both currencies and international equities together, not eliminate currency exposure through hedging.

Natural language processing and textual analysis of quarterly earnings call Q&A sections can provide valuable information about company AI investments and strategies, and this represents a major research focus for Bridgeway in 2024-2025, though they must avoid lookahead bias with LLMs trained on future data.

Classical measurements for valuation and quality metrics have degraded significantly in their ability to be used for stock picking, particularly in high-intangible industries, starting around 2016-2017.

Intangible assets are company assets that are difficult to measure but very important in explaining the market value of a company; companies develop them to enhance operational efficiency, reduce costs, and drive revenue growth, but these investments decrease net income and negatively impact book value despite being designed to be additive to growth.

Baruch Lev's book 'End of Accounting' was published and argued that traditional accounting was becoming obsolete for valuation purposes due to the rise of intangible assets.