Teiresias uses a simile to promise Odysseus THAT HE WILL HAVE A HAPPY DEATH. Simile is a figure of speech that is used to compare one thing to another one in order to make the description very emphatic. Teiresias used simile here to tell Odysseus that he will die happy at a good old age.
Madagascar ( growing vanilla crop).
Vanilla pods fetch a high price. Madagascar has right conditions for growing and harvesting these crops.