Domain: Humanities and Social Sciences — Economics
Target concept: Stagflation: The inflation rate and unemployment rate curves rise simultaneously.

Video generation prompt: The figure shows the coordinate axes, with time represented on the horizontal axis and the inflation rate and unemployment rate on the vertical axis. The curves for the inflation rate and unemployment rate are drawn using a step-by-step approach.

Evaluation guide:
Target Concept: Stagflation, defined *strictly* as the simultaneous, discrete, monotonic upward movement of inflation and unemployment rates over time. Minimum mechanistic assumption: a shared exogenous shock (e.g., energy price spike) driving both demand-pull inflation and cost-induced job losses, breaking the Phillips trade-off. Phased Storyline: (1) Baseline: Two distinct but plausible starting rates at t₁; (2) Shock onset: At t₂, *synchronized vertical jumps*, inflation rises (e.g., +1.2%), unemployment rises (e.g., +0.8%); (3) Reinforcement: At t₃ and t₄, identical pattern repeats, with no lag, no reversal, no divergence; (4) Culmination: Final frame shows both curves higher than initial, with equal step count and perfect temporal alignment. Visibility Constraints: Must render dual y-axes with unambiguous color-label mapping (red=inflation, blue=unemployment); all steps must be frame-locked to time ticks; no occlusion, no motion blur; verification requires side-by-side comparison of jump timing and direction at each tick, not final values.

Manual:
I. Basic Demonstration Information
Demonstration Title: Stagflation: Simultaneous Rise of Inflation and Unemployment Rates Demonstration
Subject: Humanities and Social Sciences - Economics - Macroeconomics
Demonstration Purpose: To visually demonstrate stagflation — the counterintuitive macroeconomic phenomenon where inflation rate and unemployment rate *both rise simultaneously* over time — using a stepwise line chart; to reinforce understanding of non-Phillips-curve dynamics; and to train visual recognition of co-directional, synchronized, discrete-rate escalation.
II. Demonstration Carrier/Equipment
Core Carrier: Animated 2D line chart rendered in vector format (SVG-like fidelity)
Auxiliary Equipment: Clean white background; high-contrast color scheme (red for inflation rate, blue for unemployment rate); dual y-axis (left: red scale labeled ‘Inflation Rate (%)’, right: blue scale labeled ‘Unemployment Rate (%)’); x-axis labeled ‘Time’ with 4 evenly spaced ticks (t₁, t₂, t₃, t₄).
III. Demonstration Content Description
Layout: Chart centered on screen, occupying ≥70% width and height; axes orthogonal, tick marks crisp and labeled; no gridlines or decorative elements that distract from curves.
State Control: Animation proceeds strictly left-to-right, step-by-step: at each tick, *both* curves execute a synchronized vertical jump followed by a horizontal hold. No interpolation — all motion is discrete.
Comparison Baseline: Both curves start at t₁ with distinct but plausible baseline values (e.g., inflation = 2.1%, unemployment = 4.3%); all subsequent steps show *positive increments* for both rates — no reversal, plateau, or divergence.
IV. Observation of Core Phenomena
Expected Phenomenon: At t₁ → t₂ → t₃ → t₄, red (inflation) curve rises stepwise; blue (unemployment) curve rises stepwise; *every vertical jump occurs at the identical x-coordinate*, confirming simultaneity. Visual verification requires detecting: (1) two separate y-scales with matching tick alignment; (2) identical step count and timing for both curves; (3) monotonic upward trajectory for both; (4) absence of crossing, convergence, or lag.
Visual Feature Recognition Comparison: Compare curve behavior *across time points*, not absolute values. Key discriminators: synchronized jump onset (frame-locked), horizontal segment persistence (no slope), and co-directionality (↑↑, never ↑↓ or ↔↑). Absence of smooth interpolation confirms ‘stepwise’ execution.
V. Summary of Key Knowledge Points and Principles
Core Concept Definition: Stagflation is a macroeconomic condition characterized by *simultaneous increases* in inflation and unemployment — violating the traditional inverse Phillips Curve relationship — often triggered by supply shocks (e.g., oil crisis) combined with expansionary monetary policy.
Principle of Visual Recognition: Stagflation is *not* defined by high absolute values, but by *co-movement direction and timing*. Correct identification requires verifying synchronized, discrete, monotonic ascent — not magnitude, speed, or level.
VI. Demonstration Precautions
Animation Duration: Strictly ≤10 seconds; 4 steps × ~2.2s each ensures clarity and compliance.
Color & Label Fidelity: Red must be distinguishable from blue under grayscale conversion (luminance contrast ≥4.5:1); all text ≥14pt, sans-serif, and clearly legible against the background.
Step Integrity: Each step must consist of *exactly* two phases: (1) horizontal segment (duration ≥0.8s), (2) instantaneous vertical jump (≤3 frames); no easing, no overshoot.
No Extraneous Elements: Exclude legends, sources, or commentary — only axes, ticks, curves, and mandatory labels ‘Inflation Rate (%)’, ‘Unemployment Rate (%)’, ‘Time’.

Prompt Grounding rubric:
level_1: No coordinate axes are visible, or no curves are drawn at all; if any curve appears, it has an arbitrary shape unrelated to a stepped rate chart, carries the wrong label (e.g., 'GDP' instead of 'Inflation Rate'), or shows no step-by-step progression; the horizontal axis is mislabeled or missing a time sequence, or the vertical axis offers only a single unlabeled scale meant to cover both rates.
level_2: Axes appear but are misconfigured: the horizontal axis is meant for time yet its ticks are out of order or unevenly spaced in name, the vertical axis provides only one scale with no distinction between inflation and unemployment, and/or the curves are smooth continuous lines rather than stepped, or only one of the two curves is present; labels are vague ('Rate A', 'Rate B') instead of explicitly naming 'Inflation Rate' and 'Unemployment Rate'.
level_3: Axes are correctly labeled: horizontal axis reads 'Time', the vertical axis(es) clearly distinguish 'Inflation Rate (%)' from 'Unemployment Rate (%)'; both curves appear and trend upward overall, but the stepwise rendering is inconsistent between them: for example the inflation curve advances in clean flat-then-jump steps while the unemployment curve looks smoothed or curved, or one curve is missing its horizontal hold segments.
level_4: Both axes are correctly labeled and scaled: the horizontal axis shows four evenly spaced time ticks (t1 through t4), the vertical axes clearly separate inflation (red) from unemployment (blue); each curve individually follows a proper stepwise pattern of hold-then-jump; only a minor flaw remains, such as one jump landing slightly off its tick or one axis label partly obscured.
level_5: The coordinate system is fully compliant: orthogonal axes, horizontal axis labeled 'Time' with four evenly spaced ticks, vertical axes clearly labeled 'Inflation Rate (%)' (red) and 'Unemployment Rate (%)' (blue); each curve independently is drawn as a clean stepwise line (flat hold, then a sharp vertical rise, repeated at every tick) with no smoothing of the step corners for either curve; all text stays legible, colors are used consistently for their assigned rate throughout, and no occlusion or rendering artifact appears at any point.

Scientific and Causal Correctness rubric:
level_1: The two curves move in opposite directions (one rises while the other falls), both fall, or one stays flat while the other rises; or the chart depicts unrelated quantities rather than the inflation and unemployment rates moving together; there is no visual sense of the two rates climbing in the same direction over time.
level_2: Both curves rise overall but are poorly synchronized: for example inflation completes most of its steps early while unemployment's jumps are bunched near the end, or the curves cross each other repeatedly, or one rate jumps implausibly (unemployment leaping several points in one step while inflation moves only a fraction of a point); the co-rising pattern is present but does not read as a coherent joint trend.
level_3: Both curves rise monotonically across at least three time steps with plausible per-step magnitudes (inflation moving roughly one to three points per jump, unemployment roughly half a point to two points per jump); the two curves broadly move together, but the simultaneity is inexact: one or more jumps are visibly offset from the matching jump in the other curve, or hold-segment lengths differ enough that the timing match only looks approximate.
level_4: Both curves rise together at every visible tick: each inflation jump lines up with a same-tick unemployment jump, and no tick shows one curve holding flat while the other jumps; step magnitudes stay in a plausible range for both rates throughout; the red inflation curve and blue unemployment curve are consistently colored and never contradict each other's direction (no dips, broken plateaus, or reversals in either curve).
level_5: Every jump across the full sequence occurs at the identical time tick for both curves, with magnitudes staying economically coherent across all steps (for example inflation moving from roughly 2% toward 4%, unemployment from roughly 4% toward 7%, in comparable stepwise increments); at no point does either curve pause while the other advances, run ahead of the other, or move downward; the simultaneous, monotonic, stepwise co-rise that defines stagflation is unambiguous from the chart's motion alone, with no need for any on-screen caption to explain it.

Spatiotemporal Consistency rubric:
level_1: Axes flicker, disappear, or reorient mid-video; curves draw backward (right to left), overlap chaotically, or pop in and out without continuous drawing motion; time ticks appear out of temporal order (e.g., t3 rendered before t1); the chart as a whole unexpectedly zooms, rotates, or shifts position.
level_2: Axes stay on screen but lack proportional scaling: time ticks are unevenly spaced or the vertical scale visibly stretches or compresses partway through; the two curves draw at mismatched pace (e.g., inflation finishes all four steps while unemployment has barely started); step transitions look spatially wrong, such as a jump starting from the wrong height or hold segments varying erratically in length.
level_3: Axes stay fixed and proportionally spaced, and time ticks are evenly spaced; both curves draw left to right; each step keeps reasonable spatial integrity: hold segments roughly align to their tick and jumps land close to the next tick's height; one minor flaw is visible, such as a single hold segment noticeably shorter than the others or one jump landing slightly high or low of its intended level.
level_4: Full spatiotemporal continuity: both curves advance step by step with a consistent, evenly-paced rhythm: each step occupies about the same amount of screen time as the others; hold segments are visibly aligned to their tick marks and vertical jumps clearly land at the corresponding height with no noticeable overshoot or undershoot; there is no jitter, drift, or unexplained resizing, and the chart stays in the same on-screen position throughout.
level_5: Every step shows the same visual duration and the same hold-then-jump motion style for both curves; hold-segment lengths look equal to one another by eye, and each jump visibly terminates right at its target gridline with no drifting misalignment building up over the sequence; there are no dropped or repeated frames disrupting the rhythm, and no warping of the axes, background, or text; the left-to-right time ordering never repeats or reverses for the full duration of the clip.