Assume a distant tribe only harvests breadfruit and its entire livelihood depends on it. If the price of breadfruit were to rise suddenly how might it be possible that this tribe would actually consume more breadfruit?

What will be an ideal response?

The substitution effect would cause a decline in the consumption of bread fruit ceteris paribus. However, because breadfruit is the principle means by which the tribe earns its income there is also an income effect. If breadfruit is a normal good and the income effect is strong enough it can outweigh the substitution effect.