| Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 |
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Profit (loss) before income taxes | -131 | 80 | 200 | -59 | 230 |
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Depreciation | 31 | 17 | 59 | 91 | 119 |
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Share-based payment expenses | - | - | - | - | 3 |
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Gain on reversal of share acquisition rights | -0 | -0 | - | - | -1 |
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Increase (decrease) in allowance for doubtful accounts | 0 | 4 | 1 | 11 | 11 |
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Increase (decrease) in provision for bonuses | - | - | - | - | 8 |
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Increase (decrease) in provision for bonuses for directors (and other officers) | - | - | - | - | 25 |
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Interest income | -0 | -0 | -0 | -0 | -0 |
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Interest expenses | 2 | 2 | 1 | 0 | 0 |
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Decrease (increase) in trade receivables | -20 | -24 | -34 | -28 | -41 |
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Decrease (increase) in advance payments to suppliers | -53 | -459 | -69 | -403 | -284 |
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Increase (decrease) in trade payables | 2 | 7 | -1 | 7 | -1 |
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Increase (decrease) in deposits received | 650 | -512 | 871 | -232 | 585 |
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Increase (decrease) in accounts payable - other | 31 | -47 | 2 | 31 | 99 |
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Increase (decrease) in contract liabilities | - | - | - | 74 | 22 |
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Other, net | 22 | 51 | -14 | -86 | -28 |
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Subtotal | 693 | -874 | 1,021 | -593 | 749 |
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Interest received | 0 | 0 | 0 | 0 | 0 |
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Interest paid | -2 | -2 | -1 | -0 | -0 |
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Income taxes refund (paid) | - | - | - | -38 | 12 |
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Net cash provided by (used in) operating activities | 691 | -876 | 1,020 | -631 | 761 |
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Purchase of property, plant and equipment | -2 | -0 | -3 | -10 | -2 |
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Purchase of intangible assets | -181 | -149 | -111 | -159 | -130 |
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Other, net | -6 | 2 | -1 | - | 0 |
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Net cash provided by (used in) investing activities | -190 | -147 | -114 | -169 | -132 |
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Repayments of long-term borrowings | -112 | -58 | -54 | -32 | -32 |
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Proceeds from issuance of share acquisition rights | 0 | 0 | 0 | 1 | 2 |
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Purchase of treasury shares | - | - | - | -0 | -0 |
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Net cash provided by (used in) financing activities | 28 | 10 | 185 | -32 | -31 |
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Net increase (decrease) in cash and cash equivalents | 529 | -1,013 | 1,091 | -832 | 598 |
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