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What the picker changes
  • Top topics digest — the cards score the selected period against the prior 4 weeks.
  • 12-week heatmap & outlet matrix — show the 12 weeks ending at the selected week (they slide back with the picker, they aren’t a fixed snapshot).
  • Per-topic volume / alias drift — same 12-week trailing window, anchored on the selected period.
  • Coverage gap quadrant — scores the selected period against the 12 weeks before it (not including it).
  • Anomaly cards — only show alerts the detector fired during the selected period. Quiet weeks legitimately show none.
What stays as-is
  • Outlet orientation strip / lean colours — context-only, drawn from the last 12 weeks of activity regardless.
  • Co-occurrence graph — recent-activity anchored, not picker-driven.
  • Source & topic profiles — all-time data for the topic; the picker doesn’t affect them.
Rolling 7 days is a sliding live window for “current vibes”; switch to Weekly to compare specific weeks side-by-side.
Weekly Rolling 7 days
live window
Topic · social

Supermarket Duopoly

161 posts · 38,854 engagement · first seen 14 May 2015 · last seen 25 Oct 2026

The dominance of New Zealand's grocery market by two major supermarket chains, and ongoing policy debates and regulatory efforts — including Commerce Commission scrutiny and government-led reforms — aimed at increasing competition and reducing prices for consumers.

Stance breakdown

How the per-edge framings classify across 125 classified edges. Each framing is labelled by a small AI stance classifier; see the methodology page for details.

19%
79%
Supportive 24 Critical 99 Neutral / explainer 2

Sentiment breakdown

Whole-post emotional valence across 126 classified posts that reference this topic. Distinct from stance: a post can be supportive of the topic and still negative in tone (an angry supporter) — the two together capture the texture short-form posts compress into very few words.

28%
16%
56%
Positive 35 Neutral 20 Negative 71

Platform mix

Where the conversation is happening. Engagement is volume-weighted (likes + 2×shares + 3×replies); a small number of high-impact posts can outrank a high-volume but low-engagement platform.

  • facebook
    17 posts · 19,618 engagement
    19,618
  • reddit
    19 posts · 7,084 engagement
    7,084
  • youtube
    81 posts · 5,117 engagement
    5,117
  • twitter
    9 posts · 834 engagement
    834

Top posts by engagement

The most-engaged posts referencing this topic. Engagement is likes + 2×shares + 3×replies; the order matches the digest ranking on /social.