The crisis the world economy is going through is without precedent. Measures taken to fight against the corona virus outbreak have, as an effect, to stop the economic activity. Household aren’t anymore moving around, which hurts entire sectors: air transport, hotels, airports, restaurants. Shuted up at home, they don’t consume anymore, except to satisfy essential needs and shops, malls and soon markets close. Enterprises have no more clients or spare parts to produce. Home working is only possible for some services activities. To produce, you need to be there. Plants put their workers on unemployment and close. But ...