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Conference slide deck (IMA World Congress 2026) for the VAT paper#18

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Conference slide deck (IMA World Congress 2026) for the VAT paper#18
vahid-ahmadi wants to merge 3 commits into
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slides

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Adds a presentation deck under paper/slides/, adapting the metropolis Chicago template to the main-branch VAT firm-microsimulation paper. Built for IMA World Congress 2026, Brussels — Parallel Session 4A (Tax Analysis).

What's here

  • paper/slides/slides.tex — 29-frame beamer deck (compile: xelatex slides.tex, run twice)
  • paper/slides/slides.pdf — compiled deck
  • Figures/ — paper figures (vendored from paper/figures/)
  • logo/ — official PolicyEngine logos (from policyengine-app-v2)

Design

  • PolicyEngine branding matched to the poster: light-teal header banner with deep-teal text, transparent PE mark in every header corner, centered title slide with the teal wordmark.
  • Section dividers on a light-teal background with a slim step-progress bar that fills as the talk advances.
  • Narrative in paper-section order: motivation (ONS/HMRC/OBR figures) → data & calibration → static costing → bunching & dominated region → behavioural layer → conclusion.
  • Appendix backup slides (synthetic-data generation, notch vs kink, behavioural-cost table, secondary-notch arithmetic, limitations) reachable via hyperlink nav buttons — all verified to resolve.

Content fidelity

All numbers extracted directly from the paper sections (verified by parallel review): £17,000 notch, £85k→£90k anchor (£175m vs HMRC £185m), reform menu (−£508m/−£336m/−£343m/−£171m), dominated region a=£21,250, bunching b=0.060 / E=8,712 with the placebo collapse, and the behavioural e-sweep {0.05, 0.17, 0.32}.

Currency is typeset with a math-safe \pounds throughout (no stray dollar signs); citations are self-contained author-year (no bibtex).

🤖 Generated with Claude Code

vahid-ahmadi and others added 3 commits June 29, 2026 17:12
A 29-frame beamer (metropolis) talk adapting the Chicago template to the
main-branch VAT microsimulation paper:

- PolicyEngine branding: light-teal header banner + deep-teal text matching the
  poster, official transparent PE mark in every header corner, centered title
  slide with the teal wordmark, light-teal section dividers with a slim
  step-progress bar.
- Paper-section order: motivation (ONS/HMRC/OBR figures) -> data & calibration
  -> static costing -> bunching/dominated region -> behavioural -> conclusion,
  plus appendix backup slides with working hyperlink nav buttons.
- Key equations on the data, bunching, dominated-region and behavioural slides.
- Math-safe \pounds everywhere (no stray dollar signs); self-contained
  author-year citations; figures under Figures/, logos under logo/.
- Closing slide with QR to the project site and contact icons.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Sync onto the new main (PRs #19, #20 merged) and reflect Section 7's value-added
recast of the behavioural simulator.

- New slide "The firm's problem: VAT on value added (formulation A)":
  pi(y)=(1-delta)(1-tau f(y))y - C(y;n,e), with delta the deductible-input share
  (value added (1-delta)y), C the own-factor cost (inputs already netted, so
  reading C as total cost would double-count), optimum n[(1-delta)(1-tau)]^e, and
  the new formulation_a_optima figure (delta in {0,0.4,0.8} across notch and taper).
- Behavioural slide: note the simulator is a value-added base (formulation A).
  The e-sensitivity numbers (GBP508m->GBP292m, etc.) are unchanged.
- Limitations: the "turnover-tax approximation" bullet now states the simulator
  taxes value added with a parametric delta (ONS Supply-Use to come), still
  abstracting from voluntary registration.

Rebuilt slides.pdf (30 pages).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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