# XWUIChartElasticity

An elasticity chart variant backed by `XWUIChart` that visualizes how responsively one quantity moves as another changes, the classic shape for price-versus-demand and similar sensitivity readouts. It inherits the shared chart-block contract, so provide named `series` of `{ x, y }` points and choose a `block` (1-4) and `size` preset with no per-variant configuration overhead.

## Basic Usage

Two named monthly series (Series A and Series B), each spanning Jan through Jun, plotted as an elasticity chart.

```example
file: examples/BasicUsage.ts
html: examples/BasicUsage.html
title: Basic Usage
description: Two six-month series rendered as an elasticity chart at the md preset.
```

## Demand Curve: Price vs Units Sold

A single downward-sloping demand curve with a target-price reference line drawn at the matching unit volume.

```example
file: examples/DemandCurve.ts
html: examples/DemandCurve.html
title: Demand Curve: Price vs Units Sold
description: Units sold versus price with grid values and a target-price annotation.
```

## Subscription Price Elasticity

Basic and Pro subscriber counts plotted against monthly price to contrast how elastically each tier responds.

```example
file: examples/SubscriptionElasticity.ts
html: examples/SubscriptionElasticity.html
title: Subscription Price Elasticity
description: Two subscription tiers' active-subscriber counts falling as price rises, with a legend.
```

```api
```