Jordan Hale: Hey — I have to tell you, I spent part of this week just imagining being a CFO, which is not normally how I spend my time.
Ryan Castillo: How did that go for you?
Jordan Hale: Surprisingly stressful. Because here's this person — solar manufacturing plant, Ontario — staring at a forty-million-dollar factory expansion, five-year payback, and the question is just: does she know what it's going to cost her to operate? That's it. That's the whole thing.
Ryan Castillo: And that's the carbon pricing question. Today we're getting into something that sounds technical — carbon tax versus capping total emissions — but it's actually about which kind of uncertainty you hand to that CFO.
Jordan Hale: Right — and Canada made a specific choice. They went with a federal carbon tax. A flat fee per ton of pollution. Not a cap. A fee. And that choice is doing enormous work inside that spreadsheet.
Ryan Castillo: What kind of work exactly?
Jordan Hale: Like — the CFO opens a new row on the model, types in her compliance cost per ton, and the number just... sits there. Stable. Knowable. She doesn't have to run scenarios. Brookings and C2ES both flag this — investment planning certainty — as the thing businesses actually cite when they prefer a carbon tax design. It's not ideology, it's a spreadsheet that closes.
Ryan Castillo: So the forty-million-dollar decision hinges on one line item being predictable.
Jordan Hale: One line item. She models the five-year payback, the carbon cost locks in, and she approves the build. That's it.
Ryan Castillo: And if that number wasn't knowable?
Jordan Hale: Then we're in a very different conversation. But — that's not today. Today the number is certain, the model closes, and she signs it.
Ryan Castillo: Now flip it. Same CFO, same plant, same forty million — but Canada went cap-and-trade instead. She opens the model and the permit price column is... not a number. It's a range. Five dollars to a hundred dollars in a single quarter.
Jordan Hale: Wait — five to a hundred? In one quarter?
Ryan Castillo: That's not hypothetical — that's the actual price volatility profile you can see in a functioning cap-and-trade system. The permit price fluctuates with market conditions. Economic slowdown hits, demand for allowances drops, price craters. Recovery comes, demand spikes, price explodes. She can't model a five-year payback on a swing that wide.
Jordan Hale: So the expansion just... dies. Like it goes to committee and someone says we can't sign this.
Ryan Castillo: Dies in committee. But ask the next question. If the expansion dies, did the climate win? Because that's the argument for cap-and-trade. The cap fixes total emissions. Quantity certainty. The ceiling holds regardless of what the permit price does.
Jordan Hale: Right — so maybe the CFO's pain is, you know, load-bearing? Like her expansion dying is actually the mechanism working?
Ryan Castillo: In theory. But look at what actually happened when this ran in the real world. The EU Emissions Trading System — world's largest cap-and-trade scheme, launched in the mid-2000s — in its early phases, governments handed out allowances too generously. Way too many permits in circulation.
Ryan Castillo: Permit prices collapsed. And when the price collapses, firms have zero incentive to cut emissions — so emissions barely moved. The cap existed on paper. The quantity certainty that was supposed to be the whole point of the instrument just... wasn't functioning. They eventually had to redesign the entire system — added something called a Market Stability Reserve — to drain the excess allowances out.
Jordan Hale: Okay, I mean — that is genuinely shocking to me. Because the entire sales pitch for cap-and-trade over a carbon tax is emissions certainty. That's the thing. And in the EU ETS early years, they didn't even get that.
Ryan Castillo: Right — but now run the carbon tax failure the same direction. If the tax is set at, say, thirty dollars a ton and you actually need eighty dollars to shift behavior, firms just absorb it. They pass it to consumers and keep emitting. You have price certainty — perfectly predictable, completely knowable — and the emissions don't move either.
Jordan Hale: So both instruments have a specific way to fail quietly. Cap-and-trade: oversupply the allowances, price collapses, cap is fiction. Carbon tax: set the rate too low, firms absorb it, tax is... what did you call it before?
Ryan Castillo: Regulatory theatre. And that's the unresolved part — neither instrument is automatically worse. One fails on price, one fails on quantity. The question we haven't answered is which failure you can actually catch and fix before it's too late.
Jordan Hale: And that failure gap — the catching-it-before-it's-too-late thing — is actually why Parry, Black, and Zhunussova at the IMF wrote what they wrote in 2022. Like, they didn't frame it as 'here are two tools, pick one.' They framed it as a structural choice about which kind of uncertainty you're willing to assign to society. Price or quantity. One of those has to float.
Ryan Castillo: Say that more slowly.
Jordan Hale: Wait, no, I want to get this precise. A carbon tax fixes the price. You know it's thirty dollars, or fifty, or whatever the government sets. What you don't know is whether that moves the needle on emissions at all. The quantity floats. Cap-and-trade flips it exactly: the cap is fixed, the quantity of total emissions is locked, but the permit price is whatever the market says it is on any given Tuesday. One certainty, one uncertainty. You can't have both.
Ryan Castillo: That's the load-bearing axis. The whole debate lives on that single line.
Jordan Hale: That's the IMF's point. And Canada looked at that axis and said — we want the price to be knowable. Businesses get certainty, climate outcome floats. The EU looked at the same axis and said — no, the emissions ceiling is the hard constraint. EU ETS, price floats, quantity is fixed.
Ryan Castillo: Which are both rational bets. They're just different bets about which failure you can tolerate.
Jordan Hale: Different bets, yeah. But — I mean, people keep trying to escape that tradeoff. You add a price collar to an ETS — a floor and a ceiling on the permit price — and you're trying to get cost predictability without giving up the emissions cap.
Ryan Castillo: And does it work?
Jordan Hale: It redistributes the tension. That's the honest answer. If the permit price hits the ceiling, you've effectively uncapped emissions — firms can just pay the ceiling price and keep emitting past the cap. You haven't eliminated the tradeoff, you've just decided in advance which side of it you'll surrender when it gets hard enough.
Ryan Castillo: Hold on. So a price collar on an ETS is really a hidden carbon tax embedded inside a cap-and-trade system.
Jordan Hale: At the ceiling, yes. Which is a weird thing to build. You know?
Ryan Castillo: The polluter-pays principle survives both designs though — that part isn't in dispute. Whether it's a fee or a permit, the emitter pays. The argument is purely over which uncertainty gets handed to markets versus governments. And — look, both Canada and the EU accepted that principle. They just placed the risk differently.
Jordan Hale: And whether placing it the 'cleaner' way actually wins long-term — the sector-specific evidence starts pulling in directions that surprised me pretty badly.
Ryan Castillo: Sector-specific is actually where I want to push, because the IMF, World Bank, LSE Grantham — they all land in the same place: no universally superior instrument. And that sounds like humility, but I think it's actually a tell. The moment you say 'it depends on context,' you've admitted this isn't a technical question anymore.
Jordan Hale: Wait — you're saying 'no universally correct answer' is itself a political conclusion?
Ryan Castillo: I'm saying — look, if a steel mill actually benefits from cap-and-trade over a carbon tax on profit and social welfare, and a solar manufacturer gets wrecked by permit price swings, then the instrument you pick is really a choice about which industry you're willing to hurt. That's not technical optimization. That's political economy.
Jordan Hale: Okay, but — I mean, isn't that true of every policy instrument? Like, the interesting part to me is the EU ETS surviving this. Because it should have died three times by now.
Ryan Castillo: That's actually my whole point. Fifteen-plus years of price chaos in the EU ETS — collapses, reform crises, the Market Stability Reserve scramble — and it's still driving real emissions reductions in covered sectors. Meanwhile carbon taxes keep getting capped politically below the level where they'd actually work. Canada is fighting a brutal political battle just to hold its current rate.
Jordan Hale: Hold on — are you saying the messy instrument outlasted the clean one?
Ryan Castillo: That's the number that matters here. The EU ETS is still running. The 'predictable' carbon tax turned out to be predictably fragile because there's no automatic mechanism forcing correct calibration — a government can just... leave it too low forever.
Jordan Hale: Okay, but wait — isn't that survivorship bias? We're looking at the ETS because it survived. We're not counting the cap-and-trade schemes that collapsed before they could drive anything.
Ryan Castillo: No, I don't buy that — because the counterexample is the political economy, not the emissions data. Henry Paulson, former U.S. Treasury Secretary, was publicly calling for a price on carbon. That's not a left flank move. This debate isn't ideological, it's about which failure mode a political system can actually absorb without killing the instrument.
Jordan Hale: Paulson calling for carbon pricing — yeah, that's the part that always reframes it for me. Because the partisan story collapses immediately when you bring that up.
Ryan Castillo: And here's what that implies — if it's not left versus right, then the instrument choice is really about which constituency you're creating. Cap-and-trade, once it's running, creates allowance holders with a direct financial stake in keeping the cap tight. That's a lobby for stringency. A carbon tax creates... no equivalent.
Jordan Hale: Revenue recycling. That's the hidden variable — how you spend the money from either instrument changes who shows up to defend it. A rebate check going to every household is a constituency. Green investment funds are a constituency. But if the revenue just disappears into general funds, you know, the instrument becomes politically orphaned the moment it gets uncomfortable.
Ryan Castillo: So the technical choice is almost downstream of the political design. You're not picking a carbon tax or a cap — you're actually picking which interest group will still be in the room defending it in year twelve. That's what the IMF, World Bank, and Grantham all keep circling without quite saying directly. The instrument that survives isn't necessarily the optimal one. It's the one that built the right coalition on day one.
Jordan Hale: And that CFO — the one we started with — she's just... living inside whoever made that bet. Years ago. She didn't pick the instrument. Some government decided Canada would fix the price, let the quantity float, and now she opens her model and there's a number in that cell, not a range. That's not her design. That's inherited architecture.
Ryan Castillo: And if Canada had gone the other way — built a cap-and-trade, created permit markets, financial intermediaries, allowance holders with a stake in keeping the cap tight — she'd have inherited that instead. The range in the cell. No choice about it.
Jordan Hale: Right — but the part that doesn't fit is, you know, neither government can easily walk back now. Canada tries to raise the carbon tax and it's immediately a tax hike. That's the label. Visible, political, brutal to defend. The EU tries to dismantle the ETS and the allowance holders — the intermediaries, the financial players who've built positions in that market — they're a constituency at this point. The instrument created its own lobby.
Ryan Castillo: Neither has switched.
Jordan Hale: Neither has switched.
Ryan Castillo: That's the lock-in. Not the emissions data — the political structure that formed around whichever instrument you built first.
Jordan Hale: I mean — that's the thing I'll be sitting with. Not which one's better. Which failure each of them decided they could outlast.
Ryan Castillo: Good place to stop. This was a good one.
