Domodaran identifies 'weapons of mass distraction'—buzzwords like synergy, brand name, strategic consideration, and China—that analysts use to justify acquisitions or valuations when the financial numbers don't support them, signaling weak analysis rather than substance

Domodaran's Uber valuation project asks students to make narrative choices (is Uber a car service or transportation company? Local or global?) and shows that depending on narrative, Uber's value could range from $800 million to $95 billion, demonstrating that valuation differences stem from narrative disagreement, not arithmetic errors

Goodwill on accounting balance sheets is a useless asset because it only appears after an acquisition and is simply a plug variable—the difference between what a company cost and its book value—not a real economic asset that should be paid for separately

The methods and metrics taught in business school to assess company value—such as PE ratios and Return on Invested Capital—were developed for mature companies and are inappropriate for valuing young growth companies, like using a hammer to do surgery

Traders care about price (what moves it, momentum, sentiment); investors care about value (cash flows, growth, risk); CNBC is an instrument for traders, not long-term investors, because it reports on price movements and momentum rather than fundamental value changes

Growth by itself is neither good nor bad; growth destroys value when the cost of growth exceeds the returns from that growth, which is why the question about future growth should focus on value created, not growth rate alone

Investors are divided into two psychological types—story people (creative, who rely on narrative) and numbers people (analytical, who grind through data)—and successful valuation requires integrating both: story people need quantitative discipline, numbers people need imagination to tell a coherent story about the business

Venture capitalists criticize DCF (Discounted Cash Flow) valuation as inappropriate for young companies, but this criticism misunderstands what DCF is: at its core, DCF simply states that a business's value equals the present value of expected cash flows, which is a fundamental truth that has always applied regardless of the company's stage

In a simple envelope auction, someone offered to pay $24 for an envelope containing a $20 bill with a card labeled 'Control' because investment banks train analysts that acquiring control of a company yields a 20% premium, despite control having no value unless it changes the company's cash flows or risk

The 'It Proposition': if something does not affect cash flows and does not affect risk, it cannot affect value; this principle should discipline valuation by requiring that any claim about value creation (e.g., from control or synergy) must specify what it will change about the company's cash flows or risk

When valuing a company in transition or in a changing market, searching for information requires focused, hypothesis-driven research rather than blind internet searches; the valuator should open a spreadsheet listing the inputs needed for the valuation and search specifically for those inputs, avoiding distraction from interesting but irrelevant information

Mature companies like 3M can be valued with relatively high confidence using historical data because there is extensive history to draw from and the future is likely to resemble the past; young growth companies require more complex, narrative-driven approaches because there is little history and the future will likely diverge significantly from the past

Most of what passes for valuation on Wall Street is actually pricing—determining what comparable companies trade at and applying similar multiples—rather than true valuation based on cash flows, growth, and risk; real estate agents price houses by comparing similar properties, and equity analysts do the same with stock multiples

Domodaran valued Apple in March 2013 with a base case of $580, when the stock was trading at $450, and used Monte Carlo simulation with 100,000 draws to assess uncertainty rather than a single point estimate, finding a 90% probability that Apple was undervalued based on the distribution of outcomes rather than just the central estimate

The online advertising market in 2013 was approximately $120 billion globally, with Google capturing about 33% of the market, Facebook second, and numerous smaller players, establishing the total addressable market that any company like Twitter must capture share from

Domodaran assumed Twitter would achieve a 25% operating margin by maturity (between Google's 22% and Facebook's 30%), and would need to reinvest substantial capital in acquisitions and technology to achieve 24-fold revenue growth from current levels to $12 billion

Domodaran spent 97% of his analytical time on cash flow estimation for Twitter and only 3% on the discount rate, using an 11% rate (95th percentile of U.S. companies) without detailed analysis because he believes the biggest risks to valuation accuracy come from growth and margin assumptions, not the discount rate

Domodaran valued Twitter at $18 per share the week before its IPO; the stock was priced at $26 and opened at $46, and he explains he has no obligation to explain what others paid, only to assess the value relative to what he believes it's worth

The social media space is fundamentally a pricing space, not a valuation space; the driver of market value for social media companies is not revenue or earnings (most make little), but user count, with the market paying approximately $100 per user

Social media companies are like operating a 'gigantic store with nothing on the shelves and lots of foot traffic'—you have users and engagement but no mechanism to monetize, so you're betting that if you build user base, ways to make money will eventually emerge ('if we build it, he will come')