Tirohanga Whānui | Overview
Students carry Lesson 2's kūmara focus outward to a truly global staple. They discover why rice feeds more than half the world's population, trace the trade routes that deliver rice to Aotearoa, and calculate what real supply-chain disruption would mean for NZ households. The lesson builds the economic concept of global interdependence — that when the world specialises in food production, everyone depends on supply chains staying open.
Ngā Whāinga Ako | Learning Intentions
- Explain why rice became the world's dominant staple crop.
- Trace the trade routes that supply rice to Aotearoa New Zealand.
- Calculate what a supply disruption would mean for a NZ household.
Ngā Paearu Angitū | Success Criteria
- Students can name at least two reasons rice became dominant and connect them to the concept of comparative advantage.
- Students can identify the top three rice-exporting nations and describe one route from Asia to Aotearoa.
- Students can calculate annual rice consumption for a household and explain the impact of a 50% price rise.
Do Now: From Local to Global
10 minsWhat it is: A retrieval bridge that connects Lesson 2's kūmara storage system with today's global lens, setting up the contrast between local seasonal food and global trade-dependent food.
Run it
- Quick write (3 min): students respond — "kūmara solved the scarcity problem by... but the solution only worked for..."
- Prompt the gap (3 min): ask, "What food in your house couldn't have been grown in pre-colonial Aotearoa? Where did it come from?" Take 3–4 answers.
- Introduce rice (4 min): "Rice is grown in tropical and subtropical Asia. Aotearoa grows none at all — every grain we eat is imported. So how does it get here, and what happens if it stops?" Hold the answer for the map activity.
Watch: Why is Rice So Popular?
15 minsWhat it is: A TED-Ed short that explains the biological, agricultural, and economic reasons rice became the world's most important staple crop. Students watch to build the "why rice?" foundation before they map where it comes from.
Before watching (2 min)
Ask students: "Why do you think one grain — rice — feeds more people than any other plant? Write one hypothesis."
While watching
Students note: (a) the biological reason rice grows well in paddy fields, (b) one country that depends on rice for more than half its daily calories, (c) one trade or economics fact they didn't know before.
After watching (3 min)
Pair-share notes. Then ask: "The video explains why rice won. But what does that mean for countries — like Aotearoa — that can't grow it?" Connect to the map activity.
Act 1: Map the Rice Trade Route
20 minsWhat it is: Students map the real supply chain that delivers rice to Aotearoa — from growing regions through exporters, shipping lanes, and NZ ports.
Run it
- Orient (3 min): share the shape of the trade — the world's five largest rice exporters are, in order, India, Thailand, Vietnam, Pakistan and the United States. Between them they ship close to three-quarters of all rice traded internationally, and India alone accounts for roughly 40% of it. Exact shares move every year with harvests and export bans, so treat these as the pattern, not fixed numbers. NZ buys most of its rice from Australia (SunRice), Thailand and India.
- Pair mapping (12 min): using the Rice Trade Route Map handout, pairs draw at least two routes from exporter to Aotearoa, labelling: country of origin → shipping route → NZ port (Auckland/Tauranga).
- Disruption question (5 min): "In 2022, India banned rice exports for a period to protect domestic supply. What would happen to NZ rice prices?" Take answers — set up the calculation activity.
Act 2: Calculate Household Dependency
15 minsWhat it is: A numeracy task where the maths has real meaning — how much does a family depend on imported rice, and what does disruption actually cost?
Run it
- Set up the numbers (3 min): the Consumption Calculation handout puts NZ at about 14 kg of rice per person per year, so a household of four uses roughly 56 kg a year. At $2.50/kg that is: 56 × $2.50 = $140. Treat the price as a working figure — use your own supermarket price if it differs. If your class eats more or less rice than that, use their number instead — the method is the point, not the figure.
- Calculation task (8 min): students complete the Consumption Calculation worksheet, working out: (a) annual cost at current price, (b) annual cost if price rises 50% (global supply shock), (c) the dollar difference, (d) which budget item a family might reduce to afford the extra cost.
- Connect (4 min): ask, "Bangladesh eats about 181 kg of rice per person each year — the highest rate in Asia, and around thirteen times our 14 kg. How much more would a supply disruption hurt a household there than one here?" The point: not all countries have the same exposure to disruption.
Synthesis: Interdependence Writing
15 minsWhat it is: A short structured writing task that asks students to synthesise the lesson's key idea — global food trade means everyone depends on systems they cannot control.
Run it
- Model the frame (2 min): write on the board — "Aotearoa's rice supply depends on... If this is disrupted, ... The community most affected would be... because..."
- Individual writing (10 min): students complete the frame, drawing on the map, calculation, and video. Stronger students should add a second example using a different country.
- Exit claim (3 min): one sentence only — "Global food interdependence means ___." Collect to check readiness for Lesson 4's famine case study.
🎯 Curriculum Alignment
Focus for this lesson: The economy is made up of different sectors: the primary sector involves getting raw materials, such as fishing, farming, and mining; the secondary sector involves manufacturing goods; the tertiary sector involves providing services, such as retail, education, and healthcare.
This is Te Kete Ako's own framing of the lesson's focus, not a quotation from Te Mātaiaho. It paraphrases live statement 13917 (Social Sciences · Phase 3), whose stored text carries list-marker corruption and so cannot be quoted byte-faithfully. The unit's verified curriculum statements are on the curriculum alignment page.
This lesson traces rice through the primary sector (farming in Vietnam, Thailand, India), the secondary sector (milling, processing), and the tertiary sector (shipping, retail) — all the way to a NZ household. The supply disruption calculation makes the abstract concept of interdependence concrete and personally relevant.
📦 Materials & Resources
- Rice Trade Route Map
- Household Consumption Calculation
- Trading Game Protocol (optional enrichment)
- Internet or world map for reference (checking shipping routes).
📊 Assessment Framework
Formative evidence: annotated trade route map, completed consumption calculation, and the exit writing frame.
- At support level: students identify two exporters and calculate the baseline annual cost.
- At expected level: students trace a complete route, calculate the disruption cost, and explain interdependence in writing.
- At extension level: students compare the impact of a disruption on NZ versus a rice-dependent country and explain the difference.
Use the exit claim to group students for Lesson 4: students who can articulate interdependence are ready for the famine analysis; students who struggled should have a scaffold for the cause-and-effect structure.
🚀 Extension Activities
Ask students to research the 2022 India rice export restriction and write a 3-sentence explanation of why a country might restrict food exports even when other countries need the food. They should identify the trade-off between domestic food security and global responsibility.
🔗 Unit Progression
Lessons 1–2 established scarcity and a local Aotearoa response (rua kūmara). Lesson 3 scales the same ideas globally: rice is to the world what kūmara was to pre-colonial Māori — the staple that everything else is planned around. Lesson 4 then shows what happens when that single-crop dependence is exploited by colonial power structures: the Irish Potato Famine as a case study in structural food scarcity.
📋 Teacher Planning Snapshot
Prep: print the two handouts; load the TED-Ed video and test audio; prepare the disruption question prompt.
Grouping: pairs for mapping, individual for calculation, individual for synthesis writing, whole class for exit claim.
Scaffold support: provide a partially completed map with exporters already labelled; offer the calculation formula written out (96 × $2.50 = ?).
ESOL / ELL: pre-teach: interdependence, exporter, supply chain, disruption, staple. Use the world map as a visual anchor throughout. Allow students to identify the route in their first language before translating.
Mātauranga Māori lens: rice trade demonstrates global interdependence, but also shows the risk of dependence on a single food system controlled by others — the same vulnerability that kaitiakitanga and local food sovereignty are designed to reduce. Ask: "What would the māramataka say about a food system that relies entirely on ships from the other side of the world?"