Add age-based bus fare allocation and young-person fare reform#1781
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vahid-ahmadi wants to merge 5 commits into
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Add age-based bus fare allocation and young-person fare reform#1781vahid-ahmadi wants to merge 5 commits into
vahid-ahmadi wants to merge 5 commits into
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Companion to the LCFS bus fare imputation in policyengine-uk-data (#428). Household-level COICOP 7.3.2 (bus & coach fares), mirroring petrol_spending/ diesel_spending. CPI-uprated; not added into the consumption total, which already counts bus fares via transport_consumption. Provides the passenger fare households pay (vs the ETB-based bus_subsidy_spending) for modelling bus fare reforms. Resolves #1779. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Allocate household bus_fare_spending across members by an NTS-derived,
concessionary-adjusted age weight (provisional), enabling age-targeted bus
fare reforms such as Scotland-style free travel for under-22s.
- gov.dft.bus.fare_allocation_weight_by_age: provisional per-age allocation weight
- gov.dft.bus.young_person_fare.{age_limit,rate}: policy levers (inert by default)
- household_bus_fare_weight, person_bus_fare_spending: the allocation
- bus_fare_relief: government-funded fares for eligible young people, routed
through dft_subsidy_spending so it counts as both an in-kind household
benefit and government spending
Depends on the bus_fare_spending input variable (#1780).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Adds the person/age allocation layer that lets PolicyEngine model age-targeted bus fare policies (e.g. Scotland-style free travel for under-22s), on top of the household
bus_fare_spendinginput.gov.dft.bus.fare_allocation_weight_by_age— provisional per-age weight for splitting household bus fares across members. NTS (England) bus-trip-by-age profile, adjusted for concessionary (free-pass) travel so it tracks fares paid, not trips. Clearly documented as a modelling allocation, not a fare-incidence estimate.gov.dft.bus.young_person_fare.{age_limit, rate}— policy levers. Inert by default (age_limit = 0), so baseline is unchanged. A reform setsage_limit = 22for free under-22 travel;rate(default 0 = free) supports discounts/flat fares too.household_bus_fare_weight/person_bus_fare_spending— the allocation (household_fare × age_weight / household_total_weight), conserving the household total.bus_fare_relief— government-funded fares for eligible young people. Routed throughdft_subsidy_spending, which already feeds bothhousehold_benefits(→ net income) andgov_spending(→ Exchequer cost), so both sides of the policy are captured with no core surgery.Why
bus_fare_spendingis household-level (LCFS has no person-level fares), and rail is modelled at household level too. An age-targeted reform needs the fare attributed to people, which this provides — following existing PE-UK household→person allocation patterns (housing_benefit_assessable_capital,employer_ni_response_consumer_incidence).Tests
test_bus_fare_age_allocation.py(3 passing): allocation splits by age weight and conserves the total; baseline relief is zero; an under-22 reform relieves the eligible member's allocated fare.Caveats / scope
Stacking
Stacked on #1780 (
add-bus-fare-spending-variable) — it referencesbus_fare_spending. Merge #1780 first; this PR's base will retarget tomainautomatically. Also relies on the imputation in policyengine-uk-data#428.🤖 Generated with Claude Code