Dan leaves little envelopes around the city — small notes, small gifts, small dares to be kind — for strangers to find and pass on. It's quiet, and it works. This page asks a louder question: what happens when a mayor decides to do that at the scale of a city?
Dan's program is simple. Small envelopes — a note, a coffee card, a dare to pay it forward — placed in libraries, on benches, inside transit stations, tucked into coffee shops. Strangers find them. Strangers pass them on. The cost is low. The reach compounds.
The reason it works isn't sentimental. Three decades of social-science research show that prosocial behavior is contagious, measurable, and economically consequential. The act of being kind, and the act of witnessing someone being kind, both change behavior — and they cascade through a city's social network in ways that show up in health, safety, school, and tax data.
Fowler & Christakis showed that emotional states and prosocial behaviors spread through social networks up to three degrees of separation — your friend's friend's kindness reaches you, even if you've never met them.
Dunn, Aknin & Norton found that spending money on others — even small amounts — produces measurable, durable increases in happiness for the giver, larger than equivalent spending on the self.
Sampson's Chicago research demonstrated that neighborhood-level willingness to act on shared values is a stronger predictor of low crime and good child outcomes than income, race, or policing intensity.
A directional model of what a kindness program could shift over 1–10 years in each of the four cities. Numbers below are relative-impact estimates, not forecasts — see the model notes at the bottom.
A composite of self-reported life satisfaction, neighborhood trust, and loneliness reduction — the three measures most consistently moved by prosocial-contagion interventions.
What this is. A transparent, directional model. Each slider has defined effect coefficients on each outcome, with diminishing returns at extremes and city-specific multipliers. It's built to help mayors reason about relative impact, not promise specific outcomes.
Where the coefficients come from. Effect sizes are calibrated against published research: Fowler & Christakis on three-degrees social contagion (typical 10–15% downstream behavior shift), Dunn/Aknin/Norton on prosocial-spending wellbeing effects (~10% life-satisfaction lift at scale), Sampson on collective efficacy and crime (one standard-deviation improvement correlates with ~10–15% crime reduction), and Putnam-tradition work on social capital and economic outcomes.
City multipliers. NYC has a density premium on social-contagion effects but lower property-value sensitivity (already saturated). Vancouver is property-value hypersensitive and has a longevity baseline edge. Montréal has stronger community-partner leverage given existing civic-association density. Toronto sits as the balanced reference case.
What this isn't. A forecast. Any real pilot would need local measurement infrastructure — pre/post surveys, control wards, partnership with a public-health authority — to produce defensible point estimates.
At current settings, the program shifts the mayor's projected approval and earned-media position meaningfully — without requiring a single contested policy decision. It's a rare lane: visibly good, structurally low-risk, and measurable.
Inside ThriveTO (the city's mental health strategy) and co-sponsored by Toronto Public Health. Distribution backbone: Toronto Public Library's 100 branches plus TTC stations. Anchor partner: Toronto BIA network (84 BIAs) for small-business drop points.
Neighborhood-level rollout. Toronto identifies with its 158 neighborhoods, not its city core. Launch ward by ward, let local councillors co-claim wins. Pair with NeighbourGood-style block-party infrastructure already in place.
Includes envelope production at 75/1,000 residents, 12 wards in pilot, two FTEs at the city, evaluation partnership with U of T's Munk School.
Inside Montréal en santé and the city's existing politique de l'enfant. Distribution backbone: the BAnQ library system, STM métro, and Montréal's unusually dense neighborhood-association (table de quartier) network.
Bilingual from day one — envelopes carry French and English, with Indigenous-language editions in partnership with the Kahnawake and Kanesatake nations. Lean into the city's strong civic-association culture; this works with Montréal's existing social fabric, not over it.
Lower than Toronto on a per-capita basis because of stronger community-partner leverage. Co-funded with the Province of Québec under existing social-cohesion budgets.
Inside the Healthy City Strategy and Vancouver Coastal Health's mental-wellness mandate. Distribution backbone: VPL branches, TransLink's SkyTrain and SeaBus, and the city's strong network of community centres.
Indigenous community partnership framing is non-negotiable. Co-design with the Musqueam, Squamish, and Tsleil-Waututh Nations — envelopes carry land-acknowledgment language and Indigenous-language editions. Position the program inside Vancouver's reconciliation work, not adjacent to it.
Smaller absolute size reflects Vancouver's population. Co-funded with Vancouver Foundation; evaluation partnership with UBC School of Population & Public Health.
Inside the NYC Department of Health & Mental Hygiene's mental-health portfolio (the institutional successor to ThriveNYC). Distribution backbone: the MTA subway system, NYPL/BPL/QPL across all three library systems, NYCHA community centres, the Open Streets network.
Transit-anchored — the subway is where New Yorkers actually share public space. Multilingual from day one (English, Spanish, Mandarin, Cantonese, Bengali, Russian, Haitian Creole minimum). Borough-by-borough rollout to let local council members co-claim wins.
Two-borough pilot (Bronx + Queens), envelope production at 60/1,000, three FTEs at DOHMH, evaluation partnership with Columbia Mailman School and CUNY ISLG.
Don't launch this from the mayor's office. Find an existing public-health or community-strategy umbrella — ThriveTO, Montréal en santé, Healthy City Strategy, DOHMH — and nest the program inside it. The mayor co-sponsors, but the program owner is operational, not political.
Before a single envelope goes out, lock in the evaluation: which wards are pilot, which are control, what pre/post measures (loneliness scale, neighborhood trust, 311 sentiment, ER stress-visits) are tracked, who the academic partner is. Pre-registration is the difference between a feel-good program and a defensible one.
Three months of co-design with frontline organizations, schools, BIAs, transit, libraries, faith communities, and — critically — Indigenous community partners. The envelopes themselves, the messaging, the distribution map: all of it should reflect the city it's serving.
Pilot in 2–3 wards or 1–2 boroughs for 12 months. Publish baseline and 6-month results openly. If something isn't moving, say so. Credibility now buys the right to scale later.
Year two: expand citywide if the measurement supports it, with a visible coalition — public health, libraries, transit, schools, philanthropy, BIAs. The program's strength is that no single institution owns it. The mayor's role is to keep it funded, visible, and free of partisan capture.
If you live in Toronto, Montréal, Vancouver, or New York — or anywhere else, really — this page is meant to be shared. Forward it to a city councillor, a chief of staff, a public-health director, or a mayor who'd care.