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Legendary investor Warren Buffett’s iconic warning from his 1983 shareholder letter – likening major reinvestment in weak industries to “struggling in quicksand” – remains a cornerstone of Berkshire Hathaway’s (BRK-A) capital discipline.

In 2025, as speculative fervor returns to global markets, Buffett’s refusal to chase structurally flawed sectors offers a sobering counterweight.

His approach favors durable moats, consistent cash generation, and industry structures that reward restraint as much as selection. Here are five sectors he continues to sidestep – and why.

Airlines: high altitude, low returns
 

Buffett’s brief flirtation with airline stocks in the late 2010s ended abruptly during the COVID-19 crisis, and his skepticism hasn’t softened.

Airline stocks remain plagued by overcapacity, volatile fuel costs, and limited pricing power.

Even in 2025, with travel rebounding and carriers touting efficiency gains, Buffett sees the industry’s economics as fundamentally broken.

Fixed costs are high, competition is fierce, and margin are razor-thin. “Problem isn’t management,” he once said. “It’s the industry.” For Berkshire, the skies are still off-limits.

Biotech and pharma: complexity without clarity
 

Despite their potential for innovation, biotech and pharmaceutical stocks rarely meet Buffett’s criteria for predictability and durable advantage.

Drug pipelines are expensive and uncertain, regulatory hurdles are steep, and cash flows are often binary – hinging on approvals or patent cliffs.

In 2025, with AI-driven drug discovery and gene therapies gaining traction, the “Oracle of Omaha” remains unconvinced.

He prefers businesses with clear earnings visibility and long-term pricing power – not moonshots with scientific risk and opaque economics.

Electric vehicles: hype over moat
 

Buffett’s avoidance of EV manufacturers, including Tesla Inc. (TSLA), reflects his discomfort with sectors driven by innovation cycles rather than structural advantage.

EV stocks face brutal competition, high R&D costs, and uncertain profitability. While Berkshire has exposure to battery tech and charging infrastructure through its energy holdings, it steers clear of the automakers themselves.

In Buffett’s view, the race to scale in EVs resembles a capital-intensive sprint with no guaranteed winner –  a classic quicksand scenario.

Early-stage tech: growth without guardrails
 

Buffett has long resisted investing in early-stage tech startups, citing their lack of durable moats and unpredictable business models.

In 2025, with venture capital pouring into AI, fintech, and the metaverse, Berkshire remains on the sidelines.

While Apple (AAPL) remains a core holding, it’s the exception – not the rule. Buffett favours companies with entrenched customer bases and pricing power, not those burning cash in pursuit of scale. “We don’t do hope-based investing,” he’s said.

Commoditized manufacturing and low-margin retail
 

Warren Buffett’s original investment in Berkshire Hathaway’s textile business –  and his eventual exit – taught him a lasting lesson: commoditized sectors with weak pricing power and constant reinvestment needs rarely compound capital.

In 2025, that logic still applies to low-margin retail and basic manufacturing. These industries face relentless competition, shrinking margins, and little room for differentiation.

Buffett’s playbook favors businesses that can raise prices without losing customers – not those that fight for survival on volume alone.

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